cheatsheet

Mark's Cheatsheet on Everything Cheatsheety (So I can close some tabs)

Starting off with a link of cheatsheets/guides I use regularly

• Markdown
• oh-my-zsh
• screen
• Docker
• Git
• Slack
• Kubectl

Useful commands

Linux

Systemd

systemctl <command> <service-name>

commands: start, stop, restart enable, disable, status, is-active, is-enabled, is-failed

systemctl list-units --all Lists all active units systemd knows about whether active or not

More commands on Digital Ocean guide

Ubuntu

Package Manager

• apt list --installed

• Clear out all old kernels (USE WITH CAUTION) found here

  dpkg -l linux-{image,headers}-"[0-9]*" | awk '/^ii/{ print $2}' | grep -v -e `uname -r | cut -f1,2 -d"-"` | grep -e '[0-9]' | xargs sudo apt-get -y purge

Alpine

Init

• rc-update add <service> <runlevel> (skipping runlevel will default to the default runlevel)
• rc-update del <service> <runlevel>
• rc-service <service> <start stop restart>
• rc <runlevel>
• reboot
• halt
• Available runlevels
  • default, hotplugged, manual, sysinit, boot, single, reboot, shutdown

Package Manager

• apk add <package>
• apk del <package>
• apk update Updates repository caches
• apk upgrade Upgrades all packages on the system
• apk search -v <search string>
• apk info -a <package> Get info on package
• apk info Lists all installed packages

Network

• Show listening ports netstat -ap tcp | grep -i "listen" or sudo lsof -PiTCP -sTCP:LISTEN

Utilities

Vim

• Elevate vim to write over read-only file :w !sudo tee %
• Find and replace :%s/<replace this>/<with this/g
• Delete matching lines :g/profile/d
• Delete non-matching lines :v/profile/d or :%g!/profile/d
• Set paste mode :set paste & :set nopaste
• Folding - :help usr_28
• Copy certain lines into a register (register is optional) :13,19y a
• Copy number of lines 5Y - copies 5 lines
• Paste from register a under line 7 :7pu a

Macros

• q<letter><commands>q record macro
• <number>@<letter> execute macro
• :%norm! @<letter> execute on all lines
• :5,10norm! @<letter> execute on lines 5-10
• :g/pattern/norm! @<letter> execute on all lines matching pattern

Folding

All folding commands start with z.

• zfap F-old creation - A Paragraph
• zo Fold O-pen
• zc Fold C-lose

SSH

scp transfer local file scp file.txt user@hostname:/remote/folder/

Port forwarding

Jails

• jls List jails
• jexec 1 /bin/tcsh Access jail 1 ssh -L <local_port>:<service_host>:<service_port> -p <ssh_server_port> -l <ssh_server_username> -N <ssh_server_host>

Bash

• <command> !* run new command with last arguments
• DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )" get directory of current file.
• cat V{0..100}*.sql Cat files using numerical sorting instead of alphabetical
• Last # arguments:
  • !$ last
  • !:* or !* all
  • !:1 or !^ 1st
  • !:1-3 1-3
  • !:2-* 2-last
  • $:0 The command, no args
• Ensure parameter/envvariable is set ${2?Error message} For env var, replace the 2.
• Set var with fallback DIR=${MY_ENV_VAR:-$DEFAULT_DIR}

ZSH

• cat V*.sql(n) Cats files using numerical sorting instead of alphabetical

IntelliJ

• CMD+Shift+A "Find Action"
• Shift x2 "Search Anywhere"

macOS

Copy/Paste clipboard

pbcopy pbpaste ex. cat /etc/ssh/sshd_config | pbcopy

CLI Utils

git

Staging

• git add -p interactive staging
• git add -i

Logs

• git log --follow -p -- <file> File history with diffs of each change, follows renames

Rebasing

rebase x commits onto another-branch

• git checkout -b staging-branch
• git rebase -i <SHA or HEAD~<numcommits>> --onto another-branch

Reorganize commits into new commits

• git checkout -b staging-branch
• git rebase -i <sha> Commit SHA will be one before the ones you want to edit. Can also use HEAD~numcommits format.
• In git-rebase-todo, change all but top to s or squash. You can also do this selectively with e or edit.
• Save commit messages as is.
• git reset HEAD~ to unstage all changes from squashed commits.
• Stage and create new commits.
• git rebase --continue

External CLI tools

Get IP address

• curl ifconfig.co returns public ip address