zipfile extractor

ex.sh

ex() {
  if [ -f "$1" ]; then
    case $1 in
      *.tar.gz) tar xzf $1;;
      *.rar) unrar x $1;;
      *.gz) gunzip $1;;
      *.tar) tar xf $1;;
      *.tgz) tar xzf $1;;
      *.zip) unzip $1;;
      *.7z) 7z x $1;;
      *.tar.xz) tar xf $1;;
      *) echo "'$1' cannot be extracted via ex()" ;;
    esac
  else
    echo "'$1' is not a valid file"
  fi
}