bash reference

startup files (login vs non-login)

snippets for ~/.bashrc

# Prompt with git branch
parse_git_branch() { git rev-parse --abbrev-ref HEAD 2>/dev/null; }
export PS1='\\u@\\h \\W$(gb=$(parse_git_branch); [ -n \"$gb\" ] && echo \" (\$gb)\")$ '

# Safer defaults
alias rm='rm -i'
alias cp='cp -i'
alias mv='mv -i'
alias ll='ls -alF'
alias gs='git status -sb'

# History tuning
export HISTCONTROL=ignoredups:erasedups
export HISTSIZE=5000
export HISTFILESIZE=10000
shopt -s histappend cmdhist checkwinsize

# Color grep and ls
export CLICOLOR=1
alias grep='grep --color=auto'

# Add user bin path
export PATH=\"$HOME/bin:$PATH\"

aliases (quick rules)

• Ad-hoc (current shell): alias k='kubectl'
• Persist: add to ~/.bashrc or a sourced file.
• List aliases: alias
• Show one: alias ll
• Remove: unalias ll · remove all: unalias -a
• Prefer functions when you need args/logic:

  gp() { git pull --rebase \"$@\"; }

auto-source bashrc from profile

# ~/.bash_profile
if [ -f ~/.bashrc ]; then
  . ~/.bashrc
fi

auto-attach tmux on ssh

# place in ~/.bashrc (after non-interactive guard if you have one)
if [ -n \"$SSH_CONNECTION\" ] && [ -z \"$TMUX\" ]; then
  tmux new -A -s ssh
  exit
fi

completion & prompt extras

# Enable programmable completion (Debian/Ubuntu)
if [ -f /etc/bash_completion ]; then
  . /etc/bash_completion
fi

# Timer for last command
trap 'LAST=$SECONDS' DEBUG
PROMPT_COMMAND='RT=$SECONDS; DUR=$((RT-LAST)); history -a; printf \"\"'
PS1='\\u@\\h \\W [${DUR}s]$ '

quick functions

# mkcd: make dir then cd
mkcd() { mkdir -p \"$1\" && cd \"$1\"; }

# extract various archives
x() {
  case \"$1\" in
    *.tar.bz2) tar xjf \"$1\" ;; *.tar.gz) tar xzf \"$1\" ;;
    *.bz2) bunzip2 \"$1\" ;; *.rar) unrar x \"$1\" ;;
    *.gz) gunzip \"$1\" ;; *.tar) tar xf \"$1\" ;;
    *.tbz2) tar xjf \"$1\" ;; *.tgz) tar xzf \"$1\" ;;
    *.zip) unzip \"$1\" ;; *.Z) uncompress \"$1\" ;;
    *.7z) 7z x \"$1\" ;; *) echo \"don't know how to extract '$1'\" ;;
  esac
}

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