🚀 go-pugleaf

> a) CDSPELL. In ksh (or at least on SCO's ksh), if you mis-type a directory
>    name, cd finds the closes matching directory, and prompts you for a
>    y/n entry. Each time you say no to a directory, it carries on seaching
>    down CDPATH for another possible match. Only one the end of all possible
>    directories have been refused as options, does cd report that the directory
>    does not exist.

This is not a feature of `standard' ksh.  SCO must have added it.  It's
not in Posix.2.

> b) cd name substitution. If your current directory is, say /usr/spool/uucp
>    and you type in 'cd spool lib', ksh changes you to /usr/lib/uucp. ksh
>    substitutes the second parameter for that portion of PWD that matches
>    the first parameter. Very usefull feature that.

This is not in Posix.2 either, but is easily added with a function.  Bash
allows a function to replace a builtin, and provides the `builtin' keyword
to make the functionality of the builtin available to the function.  Here,
for instance, is a shell function that provides all of the functionality
of the ksh `cd', including the name substitution.

cd()
{
	case $# in
	0)	builtin cd "$HOME" ;;
	1) 	builtin cd "$@" ;;
	2)	old="$1"
		new="$2"
		dir=$(echo "$PWD" | sed "s:$old:$new:g")
		case "$dir" in
		"$PWD")	echo "bash: cd: bad substitution" >&2 ; return 1 ;;
		*)	echo "$dir"
			builtin cd "$dir"
			;;
		esac
		;;
	*)	echo "cd: wrong arg count" >&2 ; return 1 ;;
	esac
}

--
``The use of history as therapy means the corruption of history as history.''
	-- Arthur Schlesinger

Chet Ramey, Case Western Reserve University	Internet: chet@po.CWRU.Edu