whichpkg: who installed this command?

whichpkg.sh

# whichpkg: which package installed this command?
# Detects builtins and follows symlinks. Add the code below to .bashrc/.bash_aliases
# Usage examples:
#
# nia$ whichpkg vim
# vim-gtk: /usr/bin/vim.gtk
# 
# nia$ whichpkg type
# type встроена в оболочку
# 
# nia$ whichpkg ll
# ll является алиасом для `ls -lh'
# 
# nia$ whichpkg foobarbaz
# No such command: foobarbaz

whichpkg() {
  the_type=$(type -t $1)
  if [[ -z $the_type ]]; then
    echo No such command: $1
  elif [[ "file" == $the_type ]]; then
    # readlink -f: Follow all symlinks till the end
    dpkg -S $(readlink -f $(type -p $1))  # NB: avoid `which` in favor of `type -p`! http://stackoverflow.com/a/677212/693538
  else
    # else (if it is not a file) just print the full `type` message, it is informative
    type $1
  fi
}