alias

Define or display aliases.

• alias [EN] @ Wikipedia
• alias [DE] @ Wikipedia

Documentation

• alias [EN] @ GNU Bash Reference Manual

• bash -c 'help alias'
• man 1 'bash' [EN]

Syntax

alias -p
alias [NAME[=COMMAND] ...]

Parameters

-p

Prints the list of all aliases.

Examples

Define aliases for directory listing

if type -P 'eza' >'/dev/null' 2>&1; then              # eza
  alias ls="eza --classify --time-style='long-iso'"
  alias ll='ls --git --group --header --long'
  alias l='ll --all --all'
else
  if ls --context >'/dev/null' 2>&1; then             # GNU ls version
    alias ls="ls --classify --color --time-style='long-iso'"

    if type -P 'dircolors' >'/dev/null' 2>&1; then
      eval "$(dircolors -b)"
    fi
  else                                                # other ls versions
    alias ls="ls -D '%F %T' -F -G"
  fi

  alias ll='ls -h -l'
  alias l='ll -a'
fi

alias lr='l -R'
alias lt="l -r -s 'time'"
alias lt="l -r -s 'time'"

Usable aliases for df and du

if df -T >'/dev/null' 2>&1; then                      # GNU df version
  alias df='df -h -T'
else                                                  # other df versions
  alias df='df -h'
fi

alias du='du -h'

Redefine cd to use pushd and popd

my::_cd() {
  # Provide a 'cd' command replacement using 'pushd'.
  #
  # Arguments:
  #   $1: Path (optional)
  #
  # Returns:
  #   0:  Success
  #   >0: Error

  if [[ "$#" -eq 0 ]]; then
    set -- "${HOME}"
  fi

  if [[ ! -d "$1" ]]; then
    echo "Error finding directory: $1!"
    return 1
  fi

  if ! pushd "$1" >'/dev/null' 2>&1; then
    echo "Error changing directory: $1!"
    return 1
  fi

  return 0
}

alias -- -='popd >"/dev/null" 2>&1'

if declare -F my::_cd >'/dev/null' 2>&1; then
  alias cd='my::_cd'
fi

Get env sorted

alias env='env | sort -f'