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x () {
  if [ -f $1 ]
	then
		case $1 in
			(*.tar.bz2) tar xvjf $1 ;;
			(*.tar.gz) tar xvzf $1 ;;
			(*.bz2) bunzip2 $1 ;;
			(*.rar) unrar x $1 ;;
			(*.gz) gunzip $1 ;;
			(*.tar) tar xvf $1 ;;
			(*.tbz2) tar xvjf $1 ;;
			(*.tgz) tar xvzf $1 ;;
			(*.zip) unzip $1 ;;
			(*.Z) uncompress $1 ;;
			(*.7z) 7z x $1 ;;
			(*) echo "'$1' cannot be extracted via >extract<" ;;
		esac
	else
		echo "'$1' is not a valid file"
	fi
}