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...menustart

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MacOSX

sidebar 丢失

OPTION/Alt+COMMAND+S

openofficer error

rm -rf ~/Library/Saved Application State/org.openoffice.script.savedState

Useful Commands

xxd

  • xxd <filename> 以16进制显示文件内容
  • xxd -i <filename> 转成c数组
unsigned char note_txt[] = {
  0x0a, 0x0a, 0x0a, 0x35, 0x30, 0x30, 0x30, 0x20, 0x2b, 0x20, 0x37, 0x35,
  0x30, 0x20, 0x70, 0x68, 0x6f, 0x74, 0x6f, 0x0a, 0x31, 0x32, 0x30, 0x20,
  0x20, 0xe5, 0x96, 0x9c, 0xe7, 0xb3, 0x96, 0xe9, 0xa2, 0x84, 0xe4, 0xbb,
  0x98, 0x0a, 0x35, 0x30, 0x30, 0x30, 0x20, 0xe5, 0xb0, 0x8f, 0xe5, 0x8d,
  0x97, 0xe5, 0x9b, 0xbd, 0x20, 0xe5, 0xae, 0x9a, 0xe9, 0x87, 0x91, 0x0a,
  0x0a
};
unsigned int note_txt_len = 61;

mdfind

mdfind

man ascii 字符表

 The hexadecimal set:

 00 nul   01 soh   02 stx   03 etx   04 eot   05 enq   06 ack   07 bel
 08 bs    09 ht    0a nl    0b vt    0c np    0d cr    0e so    0f si
 ...

cal 日历

  • cal 当月
  • cal -y 当年
  • -j 参数, day 显示为 当年的第几天

find files to rm

find . -name '.DS_Store' -path '*/.*' | xargs  rm

in terminal, show git branch in path

# Git branch in prompt.
parse_git_branch() {
    git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/ (\1)/'
}
export PS1="\u@\h \W\[\033[32m\]\$(parse_git_branch)\[\033[00m\] $ "

find all json file , and remove all \r

ls *.json | xargs -I {}  sh -c  "cat {} | tr -d '\r' > {}2 && mv {}2 {} "
or
ls *.json | xargs -I {}  sh -c  " tr -d '\r' < {}  > {}2 && mv {}2 {} "
  • {} : handle every file , and to prevent path with space
  • sh -c : directly use {} in redirection > not works, put them in a shell command
  • you can not do that by sed , remember sed delimits on \n newlines - they are always removed on input and reinserted on output. you may need -z mode

find pattern in specific file types

find . -type f -name '*.cpp' -o -name '*.h' -o -name '*.as'  | xargs -I {} grep  -m 1  ReturnToMap "{}" /dev/null
  • *.ext1 -o *.ext2
  • /dev/null is to show the file path
  • -m 1 stop when 1st matching

use mdfind ...

mdfind -onlyin . "kMDItemDisplayName == *.as || kMDItemDisplayName == *.cpp || kMDItemDisplayName == *.h"  | xargs -I {} grep  -m 1  ReturnToMap "{}" /dev/null

最高效的方式

grep -r --include \*.h --include \*.cpp --include \*.as ReturnToMap  .

  • -m 1 will not works as expect in -r mode

  • or more clean

grep -r --include=*.{h,cpp,as}  ReturnToMap  .
  • add -w if you want matching the whole word

bash wait previous command to finish

#！/bin/sh
echo “1”
sleep 5&
echo “3”
echo “4”
wait  #会等待wait所在bash上的所有子进程的执行结束，本例中就是sleep 5这句
echo”5”

sed 使用

  1. sed语句中如果要引用变量， 使用 双括号 " " ， 不要使用 单括号 ' '
  2. 查找/替换中 匹配 white space
    • 使用 [[:space:]] , 而不是 \s
    • 没有 + 的用法

打开文件数 / 最大链接数

launchctl limit
sudo launchctl limit maxfiles 100000 500000

sysctl kern.maxfiles
sysctl -w kern.maxfiles=20480 (or whatever number you choose)

# will lost , for centos : /etc/security/limits.conf
ulimit -a
ulimit -n 8192

性能测试

# cpu performance
python -c 'import test.pystone;print test.pystone.pystones()'

# memory speed
dd if=/dev/zero of=/dev/null bs=1m count=32768

内网传输速度测试

1台机器上 开启 iperf3 server

iperf3 -s

另一台机器上 发包测试

iperf3 -c 192.168.1.8 -R

传输速度测试方案2: speedtest

docker run -d --name speedtest -p 0.0.0.0:81:80 adolfintel/speedtest:latest

webpage
http://10.192.89.89:81/

launchd

About crond : "“The cron utility is launched by launchd(8) when it sees the existence of /etc/crontab or files in /usr/lib/cron/tabs. There should be no need to start it manually.”"

There are three main directories you can use with launchd:

  1. /Library/LaunchDaemons
    • job needs to run even when no users are logged in.
  2. /Library/LaunchAgents
    • if the job is only useful when users are logged in.
    • I learned that this has the side-effect of your job being run as 'root' after a system reboot.)
  3. $HOME/Library/LaunchAgents
    • your job will be run under your username.

Create a Mac plist file to describe your job

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>Label</key>
  <string>com.alvin.crontabtest</string>

  <key>ProgramArguments</key>
  <array>
    <string>/Users/al/bin/crontab-test.sh</string>
  </array>

  <key>Nice</key>
  <integer>1</integer>

  <key>StartInterval</key>
  <integer>60</integer>

  <key>RunAtLoad</key>
  <true/>

  <key>StandardErrorPath</key>
  <string>/tmp/AlTest1.err</string>

  <key>StandardOutPath</key>
  <string>/dev/null</string>
</dict>
</plist>

load and test it

launchctl load <path>/com.alvin.crontabtest.plist

To turned it off

launchctl unload <path>/com.alvin.crontabtest.plist

An important note about root and sudo access

If you placed your Mac plist file in one of the two system directories (/Library/LaunchDaemons, /Library/LaunchAgents), your job will be running as the root user after a system reboot. This means a couple of things:

  1. First, output files created by your script will be owned by the root user.
  2. Second, you'll need to use sudo before any of your launchctl commands, as shown here: