diff --git a/entrypoint/10-listen-on-ipv6-by-default.sh b/entrypoint/10-listen-on-ipv6-by-default.sh
index 112ad36d..f64d8cf6 100755
--- a/entrypoint/10-listen-on-ipv6-by-default.sh
+++ b/entrypoint/10-listen-on-ipv6-by-default.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env/sh
+#!/bin/sh
 # vim:sw=2:ts=2:sts=2:et
 
 set -e
diff --git a/entrypoint/15-local-resolvers.envsh b/entrypoint/15-local-resolvers.envsh
index c39e7842..d3beae9c 100755
--- a/entrypoint/15-local-resolvers.envsh
+++ b/entrypoint/15-local-resolvers.envsh
@@ -1,4 +1,4 @@
-#!/usr/bin/env/sh
+#!/bin/sh
 # vim:sw=2:ts=2:sts=2:et
 
 set -eu
diff --git a/entrypoint/20-envsubst-on-templates.sh b/entrypoint/20-envsubst-on-templates.sh
index b182fc8c..64dacd34 100755
--- a/entrypoint/20-envsubst-on-templates.sh
+++ b/entrypoint/20-envsubst-on-templates.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env/sh
+#!/bin/sh
 # vim:sw=2:ts=2:sts=2:et
 
 set -e
diff --git a/entrypoint/30-tune-worker-processes.sh b/entrypoint/30-tune-worker-processes.sh
index b2f5c721..fdae66be 100755
--- a/entrypoint/30-tune-worker-processes.sh
+++ b/entrypoint/30-tune-worker-processes.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env/sh
+#!/bin/sh
 # vim:sw=2:ts=2:sts=2:et
 
 set -eu
diff --git a/entrypoint/docker-entrypoint.sh b/entrypoint/docker-entrypoint.sh
index a9f119a0..943656ff 100755
--- a/entrypoint/docker-entrypoint.sh
+++ b/entrypoint/docker-entrypoint.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env/sh
+#!/bin/sh
 # vim:sw=2:ts=2:sts=2:et
 
 set -e
diff --git a/mainline/alpine-slim/10-listen-on-ipv6-by-default.sh b/mainline/alpine-slim/10-listen-on-ipv6-by-default.sh
index f5441f42..f64d8cf6 100755
--- a/mainline/alpine-slim/10-listen-on-ipv6-by-default.sh
+++ b/mainline/alpine-slim/10-listen-on-ipv6-by-default.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env/sh
+#!/bin/sh
 # vim:sw=2:ts=2:sts=2:et
 
 set -e
@@ -9,7 +9,7 @@ entrypoint_log() {
   fi
 }
 
-ME=$(basename $0)
+ME=$(basename "$0")
 DEFAULT_CONF_FILE="etc/nginx/conf.d/default.conf"
 
 # check if we have ipv6 available
@@ -24,10 +24,16 @@ if [ ! -f "/$DEFAULT_CONF_FILE" ]; then
 fi
 
 # check if the file can be modified, e.g. not on a r/o filesystem
-touch /$DEFAULT_CONF_FILE 2>/dev/null || { entrypoint_log "$ME: info: Cannot modify /$DEFAULT_CONF_FILE (read-only file system?)"; exit 0; }
+touch /$DEFAULT_CONF_FILE 2>/dev/null || {
+  entrypoint_log "$ME: info: Cannot modify /$DEFAULT_CONF_FILE (read-only file system?)"
+  exit 0
+}
 
 # check if the file is already modified, e.g. on a container restart
-grep -q "listen  \[::]\:80;" /$DEFAULT_CONF_FILE && { entrypoint_log "$ME: info: Listen on IPv6 is already enabled"; exit 0; }
+grep -q "listen  \[::]\:80;" /$DEFAULT_CONF_FILE && {
+  entrypoint_log "$ME: info: Listen on IPv6 is already enabled"
+  exit 0
+}
 
 if [ -f "/etc/os-release" ]; then
   . /etc/os-release
@@ -39,24 +45,24 @@ fi
 entrypoint_log "$ME: info: Getting the checksum of /$DEFAULT_CONF_FILE"
 
 case "$ID" in
-  "debian")
-    CHECKSUM=$(dpkg-query --show --showformat='${Conffiles}\n' nginx | grep $DEFAULT_CONF_FILE | cut -d' ' -f 3)
-    echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | md5sum -c - >/dev/null 2>&1 || {
-      entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
-      exit 0
-    }
-    ;;
-  "alpine")
-    CHECKSUM=$(apk manifest nginx 2>/dev/null| grep $DEFAULT_CONF_FILE | cut -d' ' -f 1 | cut -d ':' -f 2)
-    echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | sha1sum -c - >/dev/null 2>&1 || {
-      entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
-      exit 0
-    }
-    ;;
-  *)
-    entrypoint_log "$ME: info: Unsupported distribution"
+"debian")
+  CHECKSUM=$(dpkg-query --show --showformat='${Conffiles}\n' nginx | grep $DEFAULT_CONF_FILE | cut -d' ' -f 3)
+  echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | md5sum -c - >/dev/null 2>&1 || {
+    entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
+    exit 0
+  }
+  ;;
+"alpine")
+  CHECKSUM=$(apk manifest nginx 2>/dev/null | grep $DEFAULT_CONF_FILE | cut -d' ' -f 1 | cut -d ':' -f 2)
+  echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | sha1sum -c - >/dev/null 2>&1 || {
+    entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
     exit 0
-    ;;
+  }
+  ;;
+*)
+  entrypoint_log "$ME: info: Unsupported distribution"
+  exit 0
+  ;;
 esac
 
 # enable ipv6 on default.conf listen sockets
diff --git a/mainline/alpine-slim/15-local-resolvers.envsh b/mainline/alpine-slim/15-local-resolvers.envsh
index c39e7842..d3beae9c 100755
--- a/mainline/alpine-slim/15-local-resolvers.envsh
+++ b/mainline/alpine-slim/15-local-resolvers.envsh
@@ -1,4 +1,4 @@
-#!/usr/bin/env/sh
+#!/bin/sh
 # vim:sw=2:ts=2:sts=2:et
 
 set -eu
diff --git a/mainline/alpine-slim/20-envsubst-on-templates.sh b/mainline/alpine-slim/20-envsubst-on-templates.sh
index b095adb7..64dacd34 100755
--- a/mainline/alpine-slim/20-envsubst-on-templates.sh
+++ b/mainline/alpine-slim/20-envsubst-on-templates.sh
@@ -1,9 +1,9 @@
-#!/usr/bin/env/sh
+#!/bin/sh
 # vim:sw=2:ts=2:sts=2:et
 
 set -e
 
-ME=$(basename $0)
+ME=$(basename "$0")
 
 entrypoint_log() {
   if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
diff --git a/mainline/alpine-slim/30-tune-worker-processes.sh b/mainline/alpine-slim/30-tune-worker-processes.sh
index 165ec7a2..fdae66be 100755
--- a/mainline/alpine-slim/30-tune-worker-processes.sh
+++ b/mainline/alpine-slim/30-tune-worker-processes.sh
@@ -1,20 +1,23 @@
-#!/usr/bin/env/sh
+#!/bin/sh
 # vim:sw=2:ts=2:sts=2:et
 
 set -eu
 
 LC_ALL=C
-ME=$( basename "$0" )
+ME=$(basename "$0")
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
 
 [ "${NGINX_ENTRYPOINT_WORKER_PROCESSES_AUTOTUNE:-}" ] || exit 0
 
-touch /etc/nginx/nginx.conf 2>/dev/null || { echo >&2 "$ME: ERROR: Cannot modify /etc/nginx/nginx.conf (read-only file system?)"; exit 0; }
+touch /etc/nginx/nginx.conf 2>/dev/null || {
+  echo >&2 "$ME: ERROR: Cannot modify /etc/nginx/nginx.conf (read-only file system?)"
+  exit 0
+}
 
 ceildiv() {
   num=$1
   div=$2
-  echo $(( (num + div - 1) / div ))
+  echo $(((num + div - 1) / div))
 }
 
 get_cpuset() {
@@ -22,15 +25,15 @@ get_cpuset() {
   cpusetfile=$2
   ncpu=0
   [ -f "$cpusetroot/$cpusetfile" ] || return 1
-  for token in $( tr ',' ' ' < "$cpusetroot/$cpusetfile" ); do
+  for token in $(tr ',' ' ' <"$cpusetroot/$cpusetfile"); do
     case "$token" in
-      *-*)
-        count=$( seq "$(echo "$token" | tr '-' ' ')" | wc -l )
-        ncpu=$(( ncpu+count ))
-        ;;
-      *)
-        ncpu=$(( ncpu+1 ))
-        ;;
+    *-*)
+      count=$(seq "$(echo "$token" | tr '-' ' ')" | wc -l)
+      ncpu=$((ncpu + count))
+      ;;
+    *)
+      ncpu=$((ncpu + 1))
+      ;;
     esac
   done
   echo "$ncpu"
@@ -41,11 +44,11 @@ get_quota() {
   ncpu=0
   [ -f "$cpuroot/cpu.cfs_quota_us" ] || return 1
   [ -f "$cpuroot/cpu.cfs_period_us" ] || return 1
-  cfs_quota=$( cat "$cpuroot/cpu.cfs_quota_us" )
-  cfs_period=$( cat "$cpuroot/cpu.cfs_period_us" )
+  cfs_quota=$(cat "$cpuroot/cpu.cfs_quota_us")
+  cfs_period=$(cat "$cpuroot/cpu.cfs_period_us")
   [ "$cfs_quota" = "-1" ] && return 1
   [ "$cfs_period" = "0" ] && return 1
-  ncpu=$( ceildiv "$cfs_quota" "$cfs_period" )
+  ncpu=$(ceildiv "$cfs_quota" "$cfs_period")
   [ "$ncpu" -gt 0 ] || return 1
   echo "$ncpu"
 }
@@ -54,11 +57,11 @@ get_quota_v2() {
   cpuroot=$1
   ncpu=0
   [ -f "$cpuroot/cpu.max" ] || return 1
-  cfs_quota=$( cut -d' ' -f 1 < "$cpuroot/cpu.max" )
-  cfs_period=$( cut -d' ' -f 2 < "$cpuroot/cpu.max" )
+  cfs_quota=$(cut -d' ' -f 1 <"$cpuroot/cpu.max")
+  cfs_period=$(cut -d' ' -f 2 <"$cpuroot/cpu.max")
   [ "$cfs_quota" = "max" ] && return 1
   [ "$cfs_period" = "0" ] && return 1
-  ncpu=$( ceildiv "$cfs_quota" "$cfs_period" )
+  ncpu=$(ceildiv "$cfs_quota" "$cfs_period")
   [ "$ncpu" -gt 0 ] || return 1
   echo "$ncpu"
 }
@@ -74,59 +77,59 @@ get_cgroup_v1_path() {
 
   while IFS= read -r line; do
     case "$needle" in
-      "cpuset")
-        case "$line" in
-          *cpuset*)
-            found=$( echo "$line" | cut -d ' ' -f 4,5 )
-            break
-            ;;
-        esac
+    "cpuset")
+      case "$line" in
+      *cpuset*)
+        found=$(echo "$line" | cut -d ' ' -f 4,5)
+        break
+        ;;
+      esac
+      ;;
+    "cpu")
+      case "$line" in
+      *cpuset*) ;;
+      *cpu,cpuacct* | *cpuacct,cpu | *cpuacct* | *cpu*)
+        found=$(echo "$line" | cut -d ' ' -f 4,5)
+        break
         ;;
-      "cpu")
-        case "$line" in
-          *cpuset*)
-            ;;
-          *cpu,cpuacct*|*cpuacct,cpu|*cpuacct*|*cpu*)
-            found=$( echo "$line" | cut -d ' ' -f 4,5 )
-            break
-            ;;
-        esac
+      esac
+      ;;
     esac
-  done << __EOF__
-$( grep -F -- '- cgroup ' /proc/self/mountinfo )
+  done <<__EOF__
+$(grep -F -- '- cgroup ' /proc/self/mountinfo)
 __EOF__
 
   while IFS= read -r line; do
-    controller=$( echo "$line" | cut -d: -f 2 )
+    controller=$(echo "$line" | cut -d: -f 2)
     case "$needle" in
-      "cpuset")
-        case "$controller" in
-          cpuset)
-            mountpoint=$( echo "$line" | cut -d: -f 3 )
-            break
-            ;;
-        esac
+    "cpuset")
+      case "$controller" in
+      cpuset)
+        mountpoint=$(echo "$line" | cut -d: -f 3)
+        break
         ;;
-      "cpu")
-        case "$controller" in
-          cpu,cpuacct|cpuacct,cpu|cpuacct|cpu)
-            mountpoint=$( echo "$line" | cut -d: -f 3 )
-            break
-            ;;
-        esac
+      esac
+      ;;
+    "cpu")
+      case "$controller" in
+      cpu,cpuacct | cpuacct,cpu | cpuacct | cpu)
+        mountpoint=$(echo "$line" | cut -d: -f 3)
+        break
         ;;
+      esac
+      ;;
     esac
-done << __EOF__
-$( grep -F -- 'cpu' /proc/self/cgroup )
+  done <<__EOF__
+$(grep -F -- 'cpu' /proc/self/cgroup)
 __EOF__
 
   case "${found%% *}" in
-    "/")
-      foundroot="${found##* }$mountpoint"
-      ;;
-    "$mountpoint")
-      foundroot="${found##* }"
-      ;;
+  "/")
+    foundroot="${found##* }$mountpoint"
+    ;;
+  "$mountpoint")
+    foundroot="${found##* }"
+    ;;
   esac
   echo "$foundroot"
 }
@@ -140,49 +143,49 @@ get_cgroup_v2_path() {
   [ -r "/proc/self/cgroup" ] || return 1
 
   while IFS= read -r line; do
-    found=$( echo "$line" | cut -d ' ' -f 4,5 )
-  done << __EOF__
-$( grep -F -- '- cgroup2 ' /proc/self/mountinfo )
+    found=$(echo "$line" | cut -d ' ' -f 4,5)
+  done <<__EOF__
+$(grep -F -- '- cgroup2 ' /proc/self/mountinfo)
 __EOF__
 
   while IFS= read -r line; do
-    mountpoint=$( echo "$line" | cut -d: -f 3 )
-done << __EOF__
-$( grep -F -- '0::' /proc/self/cgroup )
+    mountpoint=$(echo "$line" | cut -d: -f 3)
+  done <<__EOF__
+$(grep -F -- '0::' /proc/self/cgroup)
 __EOF__
 
   case "${found%% *}" in
-    "")
-      return 1
-      ;;
-    "/")
-      foundroot="${found##* }$mountpoint"
-      ;;
-    "$mountpoint" | /../*)
-      foundroot="${found##* }"
-      ;;
+  "")
+    return 1
+    ;;
+  "/")
+    foundroot="${found##* }$mountpoint"
+    ;;
+  "$mountpoint" | /../*)
+    foundroot="${found##* }"
+    ;;
   esac
   echo "$foundroot"
 }
 
-ncpu_online=$( getconf _NPROCESSORS_ONLN )
+ncpu_online=$(getconf _NPROCESSORS_ONLN)
 ncpu_cpuset=
 ncpu_quota=
 ncpu_cpuset_v2=
 ncpu_quota_v2=
 
-cpuset=$( get_cgroup_v1_path "cpuset" ) && ncpu_cpuset=$( get_cpuset "$cpuset" "cpuset.effective_cpus" ) || ncpu_cpuset=$ncpu_online
-cpu=$( get_cgroup_v1_path "cpu" ) && ncpu_quota=$( get_quota "$cpu" ) || ncpu_quota=$ncpu_online
-cgroup_v2=$( get_cgroup_v2_path ) && ncpu_cpuset_v2=$( get_cpuset "$cgroup_v2" "cpuset.cpus.effective" ) || ncpu_cpuset_v2=$ncpu_online
-cgroup_v2=$( get_cgroup_v2_path ) && ncpu_quota_v2=$( get_quota_v2 "$cgroup_v2" ) || ncpu_quota_v2=$ncpu_online
-
-ncpu=$( printf "%s\n%s\n%s\n%s\n%s\n" \
-               "$ncpu_online" \
-               "$ncpu_cpuset" \
-               "$ncpu_quota" \
-               "$ncpu_cpuset_v2" \
-               "$ncpu_quota_v2" \
-               | sort -n \
-               | head -n 1 )
+cpuset=$(get_cgroup_v1_path "cpuset") && ncpu_cpuset=$(get_cpuset "$cpuset" "cpuset.effective_cpus") || ncpu_cpuset=$ncpu_online
+cpu=$(get_cgroup_v1_path "cpu") && ncpu_quota=$(get_quota "$cpu") || ncpu_quota=$ncpu_online
+cgroup_v2=$(get_cgroup_v2_path) && ncpu_cpuset_v2=$(get_cpuset "$cgroup_v2" "cpuset.cpus.effective") || ncpu_cpuset_v2=$ncpu_online
+cgroup_v2=$(get_cgroup_v2_path) && ncpu_quota_v2=$(get_quota_v2 "$cgroup_v2") || ncpu_quota_v2=$ncpu_online
+
+ncpu=$(printf "%s\n%s\n%s\n%s\n%s\n" \
+  "$ncpu_online" \
+  "$ncpu_cpuset" \
+  "$ncpu_quota" \
+  "$ncpu_cpuset_v2" \
+  "$ncpu_quota_v2" |
+  sort -n |
+  head -n 1)
 
 sed -i.bak -r 's/^(worker_processes)(.*)$/# Commented out by '"$ME"' on '"$(date)"'\n#\1\2\n\1 '"$ncpu"';/' /etc/nginx/nginx.conf
diff --git a/mainline/alpine-slim/docker-entrypoint.sh b/mainline/alpine-slim/docker-entrypoint.sh
index a9f119a0..943656ff 100755
--- a/mainline/alpine-slim/docker-entrypoint.sh
+++ b/mainline/alpine-slim/docker-entrypoint.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env/sh
+#!/bin/sh
 # vim:sw=2:ts=2:sts=2:et
 
 set -e
diff --git a/mainline/debian/10-listen-on-ipv6-by-default.sh b/mainline/debian/10-listen-on-ipv6-by-default.sh
index f5441f42..f64d8cf6 100755
--- a/mainline/debian/10-listen-on-ipv6-by-default.sh
+++ b/mainline/debian/10-listen-on-ipv6-by-default.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env/sh
+#!/bin/sh
 # vim:sw=2:ts=2:sts=2:et
 
 set -e
@@ -9,7 +9,7 @@ entrypoint_log() {
   fi
 }
 
-ME=$(basename $0)
+ME=$(basename "$0")
 DEFAULT_CONF_FILE="etc/nginx/conf.d/default.conf"
 
 # check if we have ipv6 available
@@ -24,10 +24,16 @@ if [ ! -f "/$DEFAULT_CONF_FILE" ]; then
 fi
 
 # check if the file can be modified, e.g. not on a r/o filesystem
-touch /$DEFAULT_CONF_FILE 2>/dev/null || { entrypoint_log "$ME: info: Cannot modify /$DEFAULT_CONF_FILE (read-only file system?)"; exit 0; }
+touch /$DEFAULT_CONF_FILE 2>/dev/null || {
+  entrypoint_log "$ME: info: Cannot modify /$DEFAULT_CONF_FILE (read-only file system?)"
+  exit 0
+}
 
 # check if the file is already modified, e.g. on a container restart
-grep -q "listen  \[::]\:80;" /$DEFAULT_CONF_FILE && { entrypoint_log "$ME: info: Listen on IPv6 is already enabled"; exit 0; }
+grep -q "listen  \[::]\:80;" /$DEFAULT_CONF_FILE && {
+  entrypoint_log "$ME: info: Listen on IPv6 is already enabled"
+  exit 0
+}
 
 if [ -f "/etc/os-release" ]; then
   . /etc/os-release
@@ -39,24 +45,24 @@ fi
 entrypoint_log "$ME: info: Getting the checksum of /$DEFAULT_CONF_FILE"
 
 case "$ID" in
-  "debian")
-    CHECKSUM=$(dpkg-query --show --showformat='${Conffiles}\n' nginx | grep $DEFAULT_CONF_FILE | cut -d' ' -f 3)
-    echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | md5sum -c - >/dev/null 2>&1 || {
-      entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
-      exit 0
-    }
-    ;;
-  "alpine")
-    CHECKSUM=$(apk manifest nginx 2>/dev/null| grep $DEFAULT_CONF_FILE | cut -d' ' -f 1 | cut -d ':' -f 2)
-    echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | sha1sum -c - >/dev/null 2>&1 || {
-      entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
-      exit 0
-    }
-    ;;
-  *)
-    entrypoint_log "$ME: info: Unsupported distribution"
+"debian")
+  CHECKSUM=$(dpkg-query --show --showformat='${Conffiles}\n' nginx | grep $DEFAULT_CONF_FILE | cut -d' ' -f 3)
+  echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | md5sum -c - >/dev/null 2>&1 || {
+    entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
+    exit 0
+  }
+  ;;
+"alpine")
+  CHECKSUM=$(apk manifest nginx 2>/dev/null | grep $DEFAULT_CONF_FILE | cut -d' ' -f 1 | cut -d ':' -f 2)
+  echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | sha1sum -c - >/dev/null 2>&1 || {
+    entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
     exit 0
-    ;;
+  }
+  ;;
+*)
+  entrypoint_log "$ME: info: Unsupported distribution"
+  exit 0
+  ;;
 esac
 
 # enable ipv6 on default.conf listen sockets
diff --git a/mainline/debian/15-local-resolvers.envsh b/mainline/debian/15-local-resolvers.envsh
index c39e7842..d3beae9c 100755
--- a/mainline/debian/15-local-resolvers.envsh
+++ b/mainline/debian/15-local-resolvers.envsh
@@ -1,4 +1,4 @@
-#!/usr/bin/env/sh
+#!/bin/sh
 # vim:sw=2:ts=2:sts=2:et
 
 set -eu
diff --git a/mainline/debian/20-envsubst-on-templates.sh b/mainline/debian/20-envsubst-on-templates.sh
index b095adb7..64dacd34 100755
--- a/mainline/debian/20-envsubst-on-templates.sh
+++ b/mainline/debian/20-envsubst-on-templates.sh
@@ -1,9 +1,9 @@
-#!/usr/bin/env/sh
+#!/bin/sh
 # vim:sw=2:ts=2:sts=2:et
 
 set -e
 
-ME=$(basename $0)
+ME=$(basename "$0")
 
 entrypoint_log() {
   if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
diff --git a/mainline/debian/30-tune-worker-processes.sh b/mainline/debian/30-tune-worker-processes.sh
index 165ec7a2..fdae66be 100755
--- a/mainline/debian/30-tune-worker-processes.sh
+++ b/mainline/debian/30-tune-worker-processes.sh
@@ -1,20 +1,23 @@
-#!/usr/bin/env/sh
+#!/bin/sh
 # vim:sw=2:ts=2:sts=2:et
 
 set -eu
 
 LC_ALL=C
-ME=$( basename "$0" )
+ME=$(basename "$0")
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
 
 [ "${NGINX_ENTRYPOINT_WORKER_PROCESSES_AUTOTUNE:-}" ] || exit 0
 
-touch /etc/nginx/nginx.conf 2>/dev/null || { echo >&2 "$ME: ERROR: Cannot modify /etc/nginx/nginx.conf (read-only file system?)"; exit 0; }
+touch /etc/nginx/nginx.conf 2>/dev/null || {
+  echo >&2 "$ME: ERROR: Cannot modify /etc/nginx/nginx.conf (read-only file system?)"
+  exit 0
+}
 
 ceildiv() {
   num=$1
   div=$2
-  echo $(( (num + div - 1) / div ))
+  echo $(((num + div - 1) / div))
 }
 
 get_cpuset() {
@@ -22,15 +25,15 @@ get_cpuset() {
   cpusetfile=$2
   ncpu=0
   [ -f "$cpusetroot/$cpusetfile" ] || return 1
-  for token in $( tr ',' ' ' < "$cpusetroot/$cpusetfile" ); do
+  for token in $(tr ',' ' ' <"$cpusetroot/$cpusetfile"); do
     case "$token" in
-      *-*)
-        count=$( seq "$(echo "$token" | tr '-' ' ')" | wc -l )
-        ncpu=$(( ncpu+count ))
-        ;;
-      *)
-        ncpu=$(( ncpu+1 ))
-        ;;
+    *-*)
+      count=$(seq "$(echo "$token" | tr '-' ' ')" | wc -l)
+      ncpu=$((ncpu + count))
+      ;;
+    *)
+      ncpu=$((ncpu + 1))
+      ;;
     esac
   done
   echo "$ncpu"
@@ -41,11 +44,11 @@ get_quota() {
   ncpu=0
   [ -f "$cpuroot/cpu.cfs_quota_us" ] || return 1
   [ -f "$cpuroot/cpu.cfs_period_us" ] || return 1
-  cfs_quota=$( cat "$cpuroot/cpu.cfs_quota_us" )
-  cfs_period=$( cat "$cpuroot/cpu.cfs_period_us" )
+  cfs_quota=$(cat "$cpuroot/cpu.cfs_quota_us")
+  cfs_period=$(cat "$cpuroot/cpu.cfs_period_us")
   [ "$cfs_quota" = "-1" ] && return 1
   [ "$cfs_period" = "0" ] && return 1
-  ncpu=$( ceildiv "$cfs_quota" "$cfs_period" )
+  ncpu=$(ceildiv "$cfs_quota" "$cfs_period")
   [ "$ncpu" -gt 0 ] || return 1
   echo "$ncpu"
 }
@@ -54,11 +57,11 @@ get_quota_v2() {
   cpuroot=$1
   ncpu=0
   [ -f "$cpuroot/cpu.max" ] || return 1
-  cfs_quota=$( cut -d' ' -f 1 < "$cpuroot/cpu.max" )
-  cfs_period=$( cut -d' ' -f 2 < "$cpuroot/cpu.max" )
+  cfs_quota=$(cut -d' ' -f 1 <"$cpuroot/cpu.max")
+  cfs_period=$(cut -d' ' -f 2 <"$cpuroot/cpu.max")
   [ "$cfs_quota" = "max" ] && return 1
   [ "$cfs_period" = "0" ] && return 1
-  ncpu=$( ceildiv "$cfs_quota" "$cfs_period" )
+  ncpu=$(ceildiv "$cfs_quota" "$cfs_period")
   [ "$ncpu" -gt 0 ] || return 1
   echo "$ncpu"
 }
@@ -74,59 +77,59 @@ get_cgroup_v1_path() {
 
   while IFS= read -r line; do
     case "$needle" in
-      "cpuset")
-        case "$line" in
-          *cpuset*)
-            found=$( echo "$line" | cut -d ' ' -f 4,5 )
-            break
-            ;;
-        esac
+    "cpuset")
+      case "$line" in
+      *cpuset*)
+        found=$(echo "$line" | cut -d ' ' -f 4,5)
+        break
+        ;;
+      esac
+      ;;
+    "cpu")
+      case "$line" in
+      *cpuset*) ;;
+      *cpu,cpuacct* | *cpuacct,cpu | *cpuacct* | *cpu*)
+        found=$(echo "$line" | cut -d ' ' -f 4,5)
+        break
         ;;
-      "cpu")
-        case "$line" in
-          *cpuset*)
-            ;;
-          *cpu,cpuacct*|*cpuacct,cpu|*cpuacct*|*cpu*)
-            found=$( echo "$line" | cut -d ' ' -f 4,5 )
-            break
-            ;;
-        esac
+      esac
+      ;;
     esac
-  done << __EOF__
-$( grep -F -- '- cgroup ' /proc/self/mountinfo )
+  done <<__EOF__
+$(grep -F -- '- cgroup ' /proc/self/mountinfo)
 __EOF__
 
   while IFS= read -r line; do
-    controller=$( echo "$line" | cut -d: -f 2 )
+    controller=$(echo "$line" | cut -d: -f 2)
     case "$needle" in
-      "cpuset")
-        case "$controller" in
-          cpuset)
-            mountpoint=$( echo "$line" | cut -d: -f 3 )
-            break
-            ;;
-        esac
+    "cpuset")
+      case "$controller" in
+      cpuset)
+        mountpoint=$(echo "$line" | cut -d: -f 3)
+        break
         ;;
-      "cpu")
-        case "$controller" in
-          cpu,cpuacct|cpuacct,cpu|cpuacct|cpu)
-            mountpoint=$( echo "$line" | cut -d: -f 3 )
-            break
-            ;;
-        esac
+      esac
+      ;;
+    "cpu")
+      case "$controller" in
+      cpu,cpuacct | cpuacct,cpu | cpuacct | cpu)
+        mountpoint=$(echo "$line" | cut -d: -f 3)
+        break
         ;;
+      esac
+      ;;
     esac
-done << __EOF__
-$( grep -F -- 'cpu' /proc/self/cgroup )
+  done <<__EOF__
+$(grep -F -- 'cpu' /proc/self/cgroup)
 __EOF__
 
   case "${found%% *}" in
-    "/")
-      foundroot="${found##* }$mountpoint"
-      ;;
-    "$mountpoint")
-      foundroot="${found##* }"
-      ;;
+  "/")
+    foundroot="${found##* }$mountpoint"
+    ;;
+  "$mountpoint")
+    foundroot="${found##* }"
+    ;;
   esac
   echo "$foundroot"
 }
@@ -140,49 +143,49 @@ get_cgroup_v2_path() {
   [ -r "/proc/self/cgroup" ] || return 1
 
   while IFS= read -r line; do
-    found=$( echo "$line" | cut -d ' ' -f 4,5 )
-  done << __EOF__
-$( grep -F -- '- cgroup2 ' /proc/self/mountinfo )
+    found=$(echo "$line" | cut -d ' ' -f 4,5)
+  done <<__EOF__
+$(grep -F -- '- cgroup2 ' /proc/self/mountinfo)
 __EOF__
 
   while IFS= read -r line; do
-    mountpoint=$( echo "$line" | cut -d: -f 3 )
-done << __EOF__
-$( grep -F -- '0::' /proc/self/cgroup )
+    mountpoint=$(echo "$line" | cut -d: -f 3)
+  done <<__EOF__
+$(grep -F -- '0::' /proc/self/cgroup)
 __EOF__
 
   case "${found%% *}" in
-    "")
-      return 1
-      ;;
-    "/")
-      foundroot="${found##* }$mountpoint"
-      ;;
-    "$mountpoint" | /../*)
-      foundroot="${found##* }"
-      ;;
+  "")
+    return 1
+    ;;
+  "/")
+    foundroot="${found##* }$mountpoint"
+    ;;
+  "$mountpoint" | /../*)
+    foundroot="${found##* }"
+    ;;
   esac
   echo "$foundroot"
 }
 
-ncpu_online=$( getconf _NPROCESSORS_ONLN )
+ncpu_online=$(getconf _NPROCESSORS_ONLN)
 ncpu_cpuset=
 ncpu_quota=
 ncpu_cpuset_v2=
 ncpu_quota_v2=
 
-cpuset=$( get_cgroup_v1_path "cpuset" ) && ncpu_cpuset=$( get_cpuset "$cpuset" "cpuset.effective_cpus" ) || ncpu_cpuset=$ncpu_online
-cpu=$( get_cgroup_v1_path "cpu" ) && ncpu_quota=$( get_quota "$cpu" ) || ncpu_quota=$ncpu_online
-cgroup_v2=$( get_cgroup_v2_path ) && ncpu_cpuset_v2=$( get_cpuset "$cgroup_v2" "cpuset.cpus.effective" ) || ncpu_cpuset_v2=$ncpu_online
-cgroup_v2=$( get_cgroup_v2_path ) && ncpu_quota_v2=$( get_quota_v2 "$cgroup_v2" ) || ncpu_quota_v2=$ncpu_online
-
-ncpu=$( printf "%s\n%s\n%s\n%s\n%s\n" \
-               "$ncpu_online" \
-               "$ncpu_cpuset" \
-               "$ncpu_quota" \
-               "$ncpu_cpuset_v2" \
-               "$ncpu_quota_v2" \
-               | sort -n \
-               | head -n 1 )
+cpuset=$(get_cgroup_v1_path "cpuset") && ncpu_cpuset=$(get_cpuset "$cpuset" "cpuset.effective_cpus") || ncpu_cpuset=$ncpu_online
+cpu=$(get_cgroup_v1_path "cpu") && ncpu_quota=$(get_quota "$cpu") || ncpu_quota=$ncpu_online
+cgroup_v2=$(get_cgroup_v2_path) && ncpu_cpuset_v2=$(get_cpuset "$cgroup_v2" "cpuset.cpus.effective") || ncpu_cpuset_v2=$ncpu_online
+cgroup_v2=$(get_cgroup_v2_path) && ncpu_quota_v2=$(get_quota_v2 "$cgroup_v2") || ncpu_quota_v2=$ncpu_online
+
+ncpu=$(printf "%s\n%s\n%s\n%s\n%s\n" \
+  "$ncpu_online" \
+  "$ncpu_cpuset" \
+  "$ncpu_quota" \
+  "$ncpu_cpuset_v2" \
+  "$ncpu_quota_v2" |
+  sort -n |
+  head -n 1)
 
 sed -i.bak -r 's/^(worker_processes)(.*)$/# Commented out by '"$ME"' on '"$(date)"'\n#\1\2\n\1 '"$ncpu"';/' /etc/nginx/nginx.conf
diff --git a/mainline/debian/docker-entrypoint.sh b/mainline/debian/docker-entrypoint.sh
index a9f119a0..943656ff 100755
--- a/mainline/debian/docker-entrypoint.sh
+++ b/mainline/debian/docker-entrypoint.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env/sh
+#!/bin/sh
 # vim:sw=2:ts=2:sts=2:et
 
 set -e
diff --git a/stable/alpine-slim/10-listen-on-ipv6-by-default.sh b/stable/alpine-slim/10-listen-on-ipv6-by-default.sh
index f5441f42..f64d8cf6 100755
--- a/stable/alpine-slim/10-listen-on-ipv6-by-default.sh
+++ b/stable/alpine-slim/10-listen-on-ipv6-by-default.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env/sh
+#!/bin/sh
 # vim:sw=2:ts=2:sts=2:et
 
 set -e
@@ -9,7 +9,7 @@ entrypoint_log() {
   fi
 }
 
-ME=$(basename $0)
+ME=$(basename "$0")
 DEFAULT_CONF_FILE="etc/nginx/conf.d/default.conf"
 
 # check if we have ipv6 available
@@ -24,10 +24,16 @@ if [ ! -f "/$DEFAULT_CONF_FILE" ]; then
 fi
 
 # check if the file can be modified, e.g. not on a r/o filesystem
-touch /$DEFAULT_CONF_FILE 2>/dev/null || { entrypoint_log "$ME: info: Cannot modify /$DEFAULT_CONF_FILE (read-only file system?)"; exit 0; }
+touch /$DEFAULT_CONF_FILE 2>/dev/null || {
+  entrypoint_log "$ME: info: Cannot modify /$DEFAULT_CONF_FILE (read-only file system?)"
+  exit 0
+}
 
 # check if the file is already modified, e.g. on a container restart
-grep -q "listen  \[::]\:80;" /$DEFAULT_CONF_FILE && { entrypoint_log "$ME: info: Listen on IPv6 is already enabled"; exit 0; }
+grep -q "listen  \[::]\:80;" /$DEFAULT_CONF_FILE && {
+  entrypoint_log "$ME: info: Listen on IPv6 is already enabled"
+  exit 0
+}
 
 if [ -f "/etc/os-release" ]; then
   . /etc/os-release
@@ -39,24 +45,24 @@ fi
 entrypoint_log "$ME: info: Getting the checksum of /$DEFAULT_CONF_FILE"
 
 case "$ID" in
-  "debian")
-    CHECKSUM=$(dpkg-query --show --showformat='${Conffiles}\n' nginx | grep $DEFAULT_CONF_FILE | cut -d' ' -f 3)
-    echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | md5sum -c - >/dev/null 2>&1 || {
-      entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
-      exit 0
-    }
-    ;;
-  "alpine")
-    CHECKSUM=$(apk manifest nginx 2>/dev/null| grep $DEFAULT_CONF_FILE | cut -d' ' -f 1 | cut -d ':' -f 2)
-    echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | sha1sum -c - >/dev/null 2>&1 || {
-      entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
-      exit 0
-    }
-    ;;
-  *)
-    entrypoint_log "$ME: info: Unsupported distribution"
+"debian")
+  CHECKSUM=$(dpkg-query --show --showformat='${Conffiles}\n' nginx | grep $DEFAULT_CONF_FILE | cut -d' ' -f 3)
+  echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | md5sum -c - >/dev/null 2>&1 || {
+    entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
+    exit 0
+  }
+  ;;
+"alpine")
+  CHECKSUM=$(apk manifest nginx 2>/dev/null | grep $DEFAULT_CONF_FILE | cut -d' ' -f 1 | cut -d ':' -f 2)
+  echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | sha1sum -c - >/dev/null 2>&1 || {
+    entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
     exit 0
-    ;;
+  }
+  ;;
+*)
+  entrypoint_log "$ME: info: Unsupported distribution"
+  exit 0
+  ;;
 esac
 
 # enable ipv6 on default.conf listen sockets
diff --git a/stable/alpine-slim/15-local-resolvers.envsh b/stable/alpine-slim/15-local-resolvers.envsh
index c39e7842..d3beae9c 100755
--- a/stable/alpine-slim/15-local-resolvers.envsh
+++ b/stable/alpine-slim/15-local-resolvers.envsh
@@ -1,4 +1,4 @@
-#!/usr/bin/env/sh
+#!/bin/sh
 # vim:sw=2:ts=2:sts=2:et
 
 set -eu
diff --git a/stable/alpine-slim/20-envsubst-on-templates.sh b/stable/alpine-slim/20-envsubst-on-templates.sh
index b095adb7..64dacd34 100755
--- a/stable/alpine-slim/20-envsubst-on-templates.sh
+++ b/stable/alpine-slim/20-envsubst-on-templates.sh
@@ -1,9 +1,9 @@
-#!/usr/bin/env/sh
+#!/bin/sh
 # vim:sw=2:ts=2:sts=2:et
 
 set -e
 
-ME=$(basename $0)
+ME=$(basename "$0")
 
 entrypoint_log() {
   if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
diff --git a/stable/alpine-slim/30-tune-worker-processes.sh b/stable/alpine-slim/30-tune-worker-processes.sh
index 165ec7a2..fdae66be 100755
--- a/stable/alpine-slim/30-tune-worker-processes.sh
+++ b/stable/alpine-slim/30-tune-worker-processes.sh
@@ -1,20 +1,23 @@
-#!/usr/bin/env/sh
+#!/bin/sh
 # vim:sw=2:ts=2:sts=2:et
 
 set -eu
 
 LC_ALL=C
-ME=$( basename "$0" )
+ME=$(basename "$0")
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
 
 [ "${NGINX_ENTRYPOINT_WORKER_PROCESSES_AUTOTUNE:-}" ] || exit 0
 
-touch /etc/nginx/nginx.conf 2>/dev/null || { echo >&2 "$ME: ERROR: Cannot modify /etc/nginx/nginx.conf (read-only file system?)"; exit 0; }
+touch /etc/nginx/nginx.conf 2>/dev/null || {
+  echo >&2 "$ME: ERROR: Cannot modify /etc/nginx/nginx.conf (read-only file system?)"
+  exit 0
+}
 
 ceildiv() {
   num=$1
   div=$2
-  echo $(( (num + div - 1) / div ))
+  echo $(((num + div - 1) / div))
 }
 
 get_cpuset() {
@@ -22,15 +25,15 @@ get_cpuset() {
   cpusetfile=$2
   ncpu=0
   [ -f "$cpusetroot/$cpusetfile" ] || return 1
-  for token in $( tr ',' ' ' < "$cpusetroot/$cpusetfile" ); do
+  for token in $(tr ',' ' ' <"$cpusetroot/$cpusetfile"); do
     case "$token" in
-      *-*)
-        count=$( seq "$(echo "$token" | tr '-' ' ')" | wc -l )
-        ncpu=$(( ncpu+count ))
-        ;;
-      *)
-        ncpu=$(( ncpu+1 ))
-        ;;
+    *-*)
+      count=$(seq "$(echo "$token" | tr '-' ' ')" | wc -l)
+      ncpu=$((ncpu + count))
+      ;;
+    *)
+      ncpu=$((ncpu + 1))
+      ;;
     esac
   done
   echo "$ncpu"
@@ -41,11 +44,11 @@ get_quota() {
   ncpu=0
   [ -f "$cpuroot/cpu.cfs_quota_us" ] || return 1
   [ -f "$cpuroot/cpu.cfs_period_us" ] || return 1
-  cfs_quota=$( cat "$cpuroot/cpu.cfs_quota_us" )
-  cfs_period=$( cat "$cpuroot/cpu.cfs_period_us" )
+  cfs_quota=$(cat "$cpuroot/cpu.cfs_quota_us")
+  cfs_period=$(cat "$cpuroot/cpu.cfs_period_us")
   [ "$cfs_quota" = "-1" ] && return 1
   [ "$cfs_period" = "0" ] && return 1
-  ncpu=$( ceildiv "$cfs_quota" "$cfs_period" )
+  ncpu=$(ceildiv "$cfs_quota" "$cfs_period")
   [ "$ncpu" -gt 0 ] || return 1
   echo "$ncpu"
 }
@@ -54,11 +57,11 @@ get_quota_v2() {
   cpuroot=$1
   ncpu=0
   [ -f "$cpuroot/cpu.max" ] || return 1
-  cfs_quota=$( cut -d' ' -f 1 < "$cpuroot/cpu.max" )
-  cfs_period=$( cut -d' ' -f 2 < "$cpuroot/cpu.max" )
+  cfs_quota=$(cut -d' ' -f 1 <"$cpuroot/cpu.max")
+  cfs_period=$(cut -d' ' -f 2 <"$cpuroot/cpu.max")
   [ "$cfs_quota" = "max" ] && return 1
   [ "$cfs_period" = "0" ] && return 1
-  ncpu=$( ceildiv "$cfs_quota" "$cfs_period" )
+  ncpu=$(ceildiv "$cfs_quota" "$cfs_period")
   [ "$ncpu" -gt 0 ] || return 1
   echo "$ncpu"
 }
@@ -74,59 +77,59 @@ get_cgroup_v1_path() {
 
   while IFS= read -r line; do
     case "$needle" in
-      "cpuset")
-        case "$line" in
-          *cpuset*)
-            found=$( echo "$line" | cut -d ' ' -f 4,5 )
-            break
-            ;;
-        esac
+    "cpuset")
+      case "$line" in
+      *cpuset*)
+        found=$(echo "$line" | cut -d ' ' -f 4,5)
+        break
+        ;;
+      esac
+      ;;
+    "cpu")
+      case "$line" in
+      *cpuset*) ;;
+      *cpu,cpuacct* | *cpuacct,cpu | *cpuacct* | *cpu*)
+        found=$(echo "$line" | cut -d ' ' -f 4,5)
+        break
         ;;
-      "cpu")
-        case "$line" in
-          *cpuset*)
-            ;;
-          *cpu,cpuacct*|*cpuacct,cpu|*cpuacct*|*cpu*)
-            found=$( echo "$line" | cut -d ' ' -f 4,5 )
-            break
-            ;;
-        esac
+      esac
+      ;;
     esac
-  done << __EOF__
-$( grep -F -- '- cgroup ' /proc/self/mountinfo )
+  done <<__EOF__
+$(grep -F -- '- cgroup ' /proc/self/mountinfo)
 __EOF__
 
   while IFS= read -r line; do
-    controller=$( echo "$line" | cut -d: -f 2 )
+    controller=$(echo "$line" | cut -d: -f 2)
     case "$needle" in
-      "cpuset")
-        case "$controller" in
-          cpuset)
-            mountpoint=$( echo "$line" | cut -d: -f 3 )
-            break
-            ;;
-        esac
+    "cpuset")
+      case "$controller" in
+      cpuset)
+        mountpoint=$(echo "$line" | cut -d: -f 3)
+        break
         ;;
-      "cpu")
-        case "$controller" in
-          cpu,cpuacct|cpuacct,cpu|cpuacct|cpu)
-            mountpoint=$( echo "$line" | cut -d: -f 3 )
-            break
-            ;;
-        esac
+      esac
+      ;;
+    "cpu")
+      case "$controller" in
+      cpu,cpuacct | cpuacct,cpu | cpuacct | cpu)
+        mountpoint=$(echo "$line" | cut -d: -f 3)
+        break
         ;;
+      esac
+      ;;
     esac
-done << __EOF__
-$( grep -F -- 'cpu' /proc/self/cgroup )
+  done <<__EOF__
+$(grep -F -- 'cpu' /proc/self/cgroup)
 __EOF__
 
   case "${found%% *}" in
-    "/")
-      foundroot="${found##* }$mountpoint"
-      ;;
-    "$mountpoint")
-      foundroot="${found##* }"
-      ;;
+  "/")
+    foundroot="${found##* }$mountpoint"
+    ;;
+  "$mountpoint")
+    foundroot="${found##* }"
+    ;;
   esac
   echo "$foundroot"
 }
@@ -140,49 +143,49 @@ get_cgroup_v2_path() {
   [ -r "/proc/self/cgroup" ] || return 1
 
   while IFS= read -r line; do
-    found=$( echo "$line" | cut -d ' ' -f 4,5 )
-  done << __EOF__
-$( grep -F -- '- cgroup2 ' /proc/self/mountinfo )
+    found=$(echo "$line" | cut -d ' ' -f 4,5)
+  done <<__EOF__
+$(grep -F -- '- cgroup2 ' /proc/self/mountinfo)
 __EOF__
 
   while IFS= read -r line; do
-    mountpoint=$( echo "$line" | cut -d: -f 3 )
-done << __EOF__
-$( grep -F -- '0::' /proc/self/cgroup )
+    mountpoint=$(echo "$line" | cut -d: -f 3)
+  done <<__EOF__
+$(grep -F -- '0::' /proc/self/cgroup)
 __EOF__
 
   case "${found%% *}" in
-    "")
-      return 1
-      ;;
-    "/")
-      foundroot="${found##* }$mountpoint"
-      ;;
-    "$mountpoint" | /../*)
-      foundroot="${found##* }"
-      ;;
+  "")
+    return 1
+    ;;
+  "/")
+    foundroot="${found##* }$mountpoint"
+    ;;
+  "$mountpoint" | /../*)
+    foundroot="${found##* }"
+    ;;
   esac
   echo "$foundroot"
 }
 
-ncpu_online=$( getconf _NPROCESSORS_ONLN )
+ncpu_online=$(getconf _NPROCESSORS_ONLN)
 ncpu_cpuset=
 ncpu_quota=
 ncpu_cpuset_v2=
 ncpu_quota_v2=
 
-cpuset=$( get_cgroup_v1_path "cpuset" ) && ncpu_cpuset=$( get_cpuset "$cpuset" "cpuset.effective_cpus" ) || ncpu_cpuset=$ncpu_online
-cpu=$( get_cgroup_v1_path "cpu" ) && ncpu_quota=$( get_quota "$cpu" ) || ncpu_quota=$ncpu_online
-cgroup_v2=$( get_cgroup_v2_path ) && ncpu_cpuset_v2=$( get_cpuset "$cgroup_v2" "cpuset.cpus.effective" ) || ncpu_cpuset_v2=$ncpu_online
-cgroup_v2=$( get_cgroup_v2_path ) && ncpu_quota_v2=$( get_quota_v2 "$cgroup_v2" ) || ncpu_quota_v2=$ncpu_online
-
-ncpu=$( printf "%s\n%s\n%s\n%s\n%s\n" \
-               "$ncpu_online" \
-               "$ncpu_cpuset" \
-               "$ncpu_quota" \
-               "$ncpu_cpuset_v2" \
-               "$ncpu_quota_v2" \
-               | sort -n \
-               | head -n 1 )
+cpuset=$(get_cgroup_v1_path "cpuset") && ncpu_cpuset=$(get_cpuset "$cpuset" "cpuset.effective_cpus") || ncpu_cpuset=$ncpu_online
+cpu=$(get_cgroup_v1_path "cpu") && ncpu_quota=$(get_quota "$cpu") || ncpu_quota=$ncpu_online
+cgroup_v2=$(get_cgroup_v2_path) && ncpu_cpuset_v2=$(get_cpuset "$cgroup_v2" "cpuset.cpus.effective") || ncpu_cpuset_v2=$ncpu_online
+cgroup_v2=$(get_cgroup_v2_path) && ncpu_quota_v2=$(get_quota_v2 "$cgroup_v2") || ncpu_quota_v2=$ncpu_online
+
+ncpu=$(printf "%s\n%s\n%s\n%s\n%s\n" \
+  "$ncpu_online" \
+  "$ncpu_cpuset" \
+  "$ncpu_quota" \
+  "$ncpu_cpuset_v2" \
+  "$ncpu_quota_v2" |
+  sort -n |
+  head -n 1)
 
 sed -i.bak -r 's/^(worker_processes)(.*)$/# Commented out by '"$ME"' on '"$(date)"'\n#\1\2\n\1 '"$ncpu"';/' /etc/nginx/nginx.conf
diff --git a/stable/alpine-slim/docker-entrypoint.sh b/stable/alpine-slim/docker-entrypoint.sh
index a9f119a0..943656ff 100755
--- a/stable/alpine-slim/docker-entrypoint.sh
+++ b/stable/alpine-slim/docker-entrypoint.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env/sh
+#!/bin/sh
 # vim:sw=2:ts=2:sts=2:et
 
 set -e
diff --git a/stable/debian/10-listen-on-ipv6-by-default.sh b/stable/debian/10-listen-on-ipv6-by-default.sh
index f5441f42..f64d8cf6 100755
--- a/stable/debian/10-listen-on-ipv6-by-default.sh
+++ b/stable/debian/10-listen-on-ipv6-by-default.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env/sh
+#!/bin/sh
 # vim:sw=2:ts=2:sts=2:et
 
 set -e
@@ -9,7 +9,7 @@ entrypoint_log() {
   fi
 }
 
-ME=$(basename $0)
+ME=$(basename "$0")
 DEFAULT_CONF_FILE="etc/nginx/conf.d/default.conf"
 
 # check if we have ipv6 available
@@ -24,10 +24,16 @@ if [ ! -f "/$DEFAULT_CONF_FILE" ]; then
 fi
 
 # check if the file can be modified, e.g. not on a r/o filesystem
-touch /$DEFAULT_CONF_FILE 2>/dev/null || { entrypoint_log "$ME: info: Cannot modify /$DEFAULT_CONF_FILE (read-only file system?)"; exit 0; }
+touch /$DEFAULT_CONF_FILE 2>/dev/null || {
+  entrypoint_log "$ME: info: Cannot modify /$DEFAULT_CONF_FILE (read-only file system?)"
+  exit 0
+}
 
 # check if the file is already modified, e.g. on a container restart
-grep -q "listen  \[::]\:80;" /$DEFAULT_CONF_FILE && { entrypoint_log "$ME: info: Listen on IPv6 is already enabled"; exit 0; }
+grep -q "listen  \[::]\:80;" /$DEFAULT_CONF_FILE && {
+  entrypoint_log "$ME: info: Listen on IPv6 is already enabled"
+  exit 0
+}
 
 if [ -f "/etc/os-release" ]; then
   . /etc/os-release
@@ -39,24 +45,24 @@ fi
 entrypoint_log "$ME: info: Getting the checksum of /$DEFAULT_CONF_FILE"
 
 case "$ID" in
-  "debian")
-    CHECKSUM=$(dpkg-query --show --showformat='${Conffiles}\n' nginx | grep $DEFAULT_CONF_FILE | cut -d' ' -f 3)
-    echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | md5sum -c - >/dev/null 2>&1 || {
-      entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
-      exit 0
-    }
-    ;;
-  "alpine")
-    CHECKSUM=$(apk manifest nginx 2>/dev/null| grep $DEFAULT_CONF_FILE | cut -d' ' -f 1 | cut -d ':' -f 2)
-    echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | sha1sum -c - >/dev/null 2>&1 || {
-      entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
-      exit 0
-    }
-    ;;
-  *)
-    entrypoint_log "$ME: info: Unsupported distribution"
+"debian")
+  CHECKSUM=$(dpkg-query --show --showformat='${Conffiles}\n' nginx | grep $DEFAULT_CONF_FILE | cut -d' ' -f 3)
+  echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | md5sum -c - >/dev/null 2>&1 || {
+    entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
+    exit 0
+  }
+  ;;
+"alpine")
+  CHECKSUM=$(apk manifest nginx 2>/dev/null | grep $DEFAULT_CONF_FILE | cut -d' ' -f 1 | cut -d ':' -f 2)
+  echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | sha1sum -c - >/dev/null 2>&1 || {
+    entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
     exit 0
-    ;;
+  }
+  ;;
+*)
+  entrypoint_log "$ME: info: Unsupported distribution"
+  exit 0
+  ;;
 esac
 
 # enable ipv6 on default.conf listen sockets
diff --git a/stable/debian/15-local-resolvers.envsh b/stable/debian/15-local-resolvers.envsh
index c39e7842..d3beae9c 100755
--- a/stable/debian/15-local-resolvers.envsh
+++ b/stable/debian/15-local-resolvers.envsh
@@ -1,4 +1,4 @@
-#!/usr/bin/env/sh
+#!/bin/sh
 # vim:sw=2:ts=2:sts=2:et
 
 set -eu
diff --git a/stable/debian/20-envsubst-on-templates.sh b/stable/debian/20-envsubst-on-templates.sh
index b095adb7..64dacd34 100755
--- a/stable/debian/20-envsubst-on-templates.sh
+++ b/stable/debian/20-envsubst-on-templates.sh
@@ -1,9 +1,9 @@
-#!/usr/bin/env/sh
+#!/bin/sh
 # vim:sw=2:ts=2:sts=2:et
 
 set -e
 
-ME=$(basename $0)
+ME=$(basename "$0")
 
 entrypoint_log() {
   if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
diff --git a/stable/debian/30-tune-worker-processes.sh b/stable/debian/30-tune-worker-processes.sh
index 165ec7a2..fdae66be 100755
--- a/stable/debian/30-tune-worker-processes.sh
+++ b/stable/debian/30-tune-worker-processes.sh
@@ -1,20 +1,23 @@
-#!/usr/bin/env/sh
+#!/bin/sh
 # vim:sw=2:ts=2:sts=2:et
 
 set -eu
 
 LC_ALL=C
-ME=$( basename "$0" )
+ME=$(basename "$0")
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
 
 [ "${NGINX_ENTRYPOINT_WORKER_PROCESSES_AUTOTUNE:-}" ] || exit 0
 
-touch /etc/nginx/nginx.conf 2>/dev/null || { echo >&2 "$ME: ERROR: Cannot modify /etc/nginx/nginx.conf (read-only file system?)"; exit 0; }
+touch /etc/nginx/nginx.conf 2>/dev/null || {
+  echo >&2 "$ME: ERROR: Cannot modify /etc/nginx/nginx.conf (read-only file system?)"
+  exit 0
+}
 
 ceildiv() {
   num=$1
   div=$2
-  echo $(( (num + div - 1) / div ))
+  echo $(((num + div - 1) / div))
 }
 
 get_cpuset() {
@@ -22,15 +25,15 @@ get_cpuset() {
   cpusetfile=$2
   ncpu=0
   [ -f "$cpusetroot/$cpusetfile" ] || return 1
-  for token in $( tr ',' ' ' < "$cpusetroot/$cpusetfile" ); do
+  for token in $(tr ',' ' ' <"$cpusetroot/$cpusetfile"); do
     case "$token" in
-      *-*)
-        count=$( seq "$(echo "$token" | tr '-' ' ')" | wc -l )
-        ncpu=$(( ncpu+count ))
-        ;;
-      *)
-        ncpu=$(( ncpu+1 ))
-        ;;
+    *-*)
+      count=$(seq "$(echo "$token" | tr '-' ' ')" | wc -l)
+      ncpu=$((ncpu + count))
+      ;;
+    *)
+      ncpu=$((ncpu + 1))
+      ;;
     esac
   done
   echo "$ncpu"
@@ -41,11 +44,11 @@ get_quota() {
   ncpu=0
   [ -f "$cpuroot/cpu.cfs_quota_us" ] || return 1
   [ -f "$cpuroot/cpu.cfs_period_us" ] || return 1
-  cfs_quota=$( cat "$cpuroot/cpu.cfs_quota_us" )
-  cfs_period=$( cat "$cpuroot/cpu.cfs_period_us" )
+  cfs_quota=$(cat "$cpuroot/cpu.cfs_quota_us")
+  cfs_period=$(cat "$cpuroot/cpu.cfs_period_us")
   [ "$cfs_quota" = "-1" ] && return 1
   [ "$cfs_period" = "0" ] && return 1
-  ncpu=$( ceildiv "$cfs_quota" "$cfs_period" )
+  ncpu=$(ceildiv "$cfs_quota" "$cfs_period")
   [ "$ncpu" -gt 0 ] || return 1
   echo "$ncpu"
 }
@@ -54,11 +57,11 @@ get_quota_v2() {
   cpuroot=$1
   ncpu=0
   [ -f "$cpuroot/cpu.max" ] || return 1
-  cfs_quota=$( cut -d' ' -f 1 < "$cpuroot/cpu.max" )
-  cfs_period=$( cut -d' ' -f 2 < "$cpuroot/cpu.max" )
+  cfs_quota=$(cut -d' ' -f 1 <"$cpuroot/cpu.max")
+  cfs_period=$(cut -d' ' -f 2 <"$cpuroot/cpu.max")
   [ "$cfs_quota" = "max" ] && return 1
   [ "$cfs_period" = "0" ] && return 1
-  ncpu=$( ceildiv "$cfs_quota" "$cfs_period" )
+  ncpu=$(ceildiv "$cfs_quota" "$cfs_period")
   [ "$ncpu" -gt 0 ] || return 1
   echo "$ncpu"
 }
@@ -74,59 +77,59 @@ get_cgroup_v1_path() {
 
   while IFS= read -r line; do
     case "$needle" in
-      "cpuset")
-        case "$line" in
-          *cpuset*)
-            found=$( echo "$line" | cut -d ' ' -f 4,5 )
-            break
-            ;;
-        esac
+    "cpuset")
+      case "$line" in
+      *cpuset*)
+        found=$(echo "$line" | cut -d ' ' -f 4,5)
+        break
+        ;;
+      esac
+      ;;
+    "cpu")
+      case "$line" in
+      *cpuset*) ;;
+      *cpu,cpuacct* | *cpuacct,cpu | *cpuacct* | *cpu*)
+        found=$(echo "$line" | cut -d ' ' -f 4,5)
+        break
         ;;
-      "cpu")
-        case "$line" in
-          *cpuset*)
-            ;;
-          *cpu,cpuacct*|*cpuacct,cpu|*cpuacct*|*cpu*)
-            found=$( echo "$line" | cut -d ' ' -f 4,5 )
-            break
-            ;;
-        esac
+      esac
+      ;;
     esac
-  done << __EOF__
-$( grep -F -- '- cgroup ' /proc/self/mountinfo )
+  done <<__EOF__
+$(grep -F -- '- cgroup ' /proc/self/mountinfo)
 __EOF__
 
   while IFS= read -r line; do
-    controller=$( echo "$line" | cut -d: -f 2 )
+    controller=$(echo "$line" | cut -d: -f 2)
     case "$needle" in
-      "cpuset")
-        case "$controller" in
-          cpuset)
-            mountpoint=$( echo "$line" | cut -d: -f 3 )
-            break
-            ;;
-        esac
+    "cpuset")
+      case "$controller" in
+      cpuset)
+        mountpoint=$(echo "$line" | cut -d: -f 3)
+        break
         ;;
-      "cpu")
-        case "$controller" in
-          cpu,cpuacct|cpuacct,cpu|cpuacct|cpu)
-            mountpoint=$( echo "$line" | cut -d: -f 3 )
-            break
-            ;;
-        esac
+      esac
+      ;;
+    "cpu")
+      case "$controller" in
+      cpu,cpuacct | cpuacct,cpu | cpuacct | cpu)
+        mountpoint=$(echo "$line" | cut -d: -f 3)
+        break
         ;;
+      esac
+      ;;
     esac
-done << __EOF__
-$( grep -F -- 'cpu' /proc/self/cgroup )
+  done <<__EOF__
+$(grep -F -- 'cpu' /proc/self/cgroup)
 __EOF__
 
   case "${found%% *}" in
-    "/")
-      foundroot="${found##* }$mountpoint"
-      ;;
-    "$mountpoint")
-      foundroot="${found##* }"
-      ;;
+  "/")
+    foundroot="${found##* }$mountpoint"
+    ;;
+  "$mountpoint")
+    foundroot="${found##* }"
+    ;;
   esac
   echo "$foundroot"
 }
@@ -140,49 +143,49 @@ get_cgroup_v2_path() {
   [ -r "/proc/self/cgroup" ] || return 1
 
   while IFS= read -r line; do
-    found=$( echo "$line" | cut -d ' ' -f 4,5 )
-  done << __EOF__
-$( grep -F -- '- cgroup2 ' /proc/self/mountinfo )
+    found=$(echo "$line" | cut -d ' ' -f 4,5)
+  done <<__EOF__
+$(grep -F -- '- cgroup2 ' /proc/self/mountinfo)
 __EOF__
 
   while IFS= read -r line; do
-    mountpoint=$( echo "$line" | cut -d: -f 3 )
-done << __EOF__
-$( grep -F -- '0::' /proc/self/cgroup )
+    mountpoint=$(echo "$line" | cut -d: -f 3)
+  done <<__EOF__
+$(grep -F -- '0::' /proc/self/cgroup)
 __EOF__
 
   case "${found%% *}" in
-    "")
-      return 1
-      ;;
-    "/")
-      foundroot="${found##* }$mountpoint"
-      ;;
-    "$mountpoint" | /../*)
-      foundroot="${found##* }"
-      ;;
+  "")
+    return 1
+    ;;
+  "/")
+    foundroot="${found##* }$mountpoint"
+    ;;
+  "$mountpoint" | /../*)
+    foundroot="${found##* }"
+    ;;
   esac
   echo "$foundroot"
 }
 
-ncpu_online=$( getconf _NPROCESSORS_ONLN )
+ncpu_online=$(getconf _NPROCESSORS_ONLN)
 ncpu_cpuset=
 ncpu_quota=
 ncpu_cpuset_v2=
 ncpu_quota_v2=
 
-cpuset=$( get_cgroup_v1_path "cpuset" ) && ncpu_cpuset=$( get_cpuset "$cpuset" "cpuset.effective_cpus" ) || ncpu_cpuset=$ncpu_online
-cpu=$( get_cgroup_v1_path "cpu" ) && ncpu_quota=$( get_quota "$cpu" ) || ncpu_quota=$ncpu_online
-cgroup_v2=$( get_cgroup_v2_path ) && ncpu_cpuset_v2=$( get_cpuset "$cgroup_v2" "cpuset.cpus.effective" ) || ncpu_cpuset_v2=$ncpu_online
-cgroup_v2=$( get_cgroup_v2_path ) && ncpu_quota_v2=$( get_quota_v2 "$cgroup_v2" ) || ncpu_quota_v2=$ncpu_online
-
-ncpu=$( printf "%s\n%s\n%s\n%s\n%s\n" \
-               "$ncpu_online" \
-               "$ncpu_cpuset" \
-               "$ncpu_quota" \
-               "$ncpu_cpuset_v2" \
-               "$ncpu_quota_v2" \
-               | sort -n \
-               | head -n 1 )
+cpuset=$(get_cgroup_v1_path "cpuset") && ncpu_cpuset=$(get_cpuset "$cpuset" "cpuset.effective_cpus") || ncpu_cpuset=$ncpu_online
+cpu=$(get_cgroup_v1_path "cpu") && ncpu_quota=$(get_quota "$cpu") || ncpu_quota=$ncpu_online
+cgroup_v2=$(get_cgroup_v2_path) && ncpu_cpuset_v2=$(get_cpuset "$cgroup_v2" "cpuset.cpus.effective") || ncpu_cpuset_v2=$ncpu_online
+cgroup_v2=$(get_cgroup_v2_path) && ncpu_quota_v2=$(get_quota_v2 "$cgroup_v2") || ncpu_quota_v2=$ncpu_online
+
+ncpu=$(printf "%s\n%s\n%s\n%s\n%s\n" \
+  "$ncpu_online" \
+  "$ncpu_cpuset" \
+  "$ncpu_quota" \
+  "$ncpu_cpuset_v2" \
+  "$ncpu_quota_v2" |
+  sort -n |
+  head -n 1)
 
 sed -i.bak -r 's/^(worker_processes)(.*)$/# Commented out by '"$ME"' on '"$(date)"'\n#\1\2\n\1 '"$ncpu"';/' /etc/nginx/nginx.conf
diff --git a/stable/debian/docker-entrypoint.sh b/stable/debian/docker-entrypoint.sh
index a9f119a0..943656ff 100755
--- a/stable/debian/docker-entrypoint.sh
+++ b/stable/debian/docker-entrypoint.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env/sh
+#!/bin/sh
 # vim:sw=2:ts=2:sts=2:et
 
 set -e