Directory aliases and quick directory navigation

`diralias` allows you to map a symbolic name to an absolute path.

`j` takes an alias name, and jumps (cd) to it.

diralias

@@ -0,0 +1,35 @@
+#!/bin/ksh
+diralias()
+{
+	typeset -i i
+	case $# in
+	0)
+		let i=0
+		while (( i < ${#DIRALIASNAM[@]} ))
+		do
+			printf "%s\t%s\n" ${DIRALIASNAM[i]} "${DIRALIASVAL[i]}"
+			let i++
+		done
+		;;
+	1)
+		let i=0
+		while [[ i -lt ${#DIRALIASNAM[@]} && $1 != ${DIRALIASNAM[i]} ]]
+		do
+			let i++
+		done
+		(( i == ${#DIRALIASNAM[@]} )) && echo $1 || echo ${DIRALIASVAL[i]}
+		;;
+	2)
+		let i=0
+		while [[ i -lt ${#DIRALIASNAM[@]} && $1 != ${DIRALIASNAM[i]} ]]
+		do
+			let i++
+		done
+		DIRALIASNAM[i]=$1
+		DIRALIASVAL[i]="$2"
+		;;
+	*)
+		exit 64
+		;;
+	esac
+}

j

@@ -0,0 +1,14 @@
+#!/bin/ksh
+j()
+{
+	local da
+	da=$(diralias $1)
+	if echo $da | grep '^!' >/dev/null
+	then
+		if ! da=$(eval $(echo "$da" | sed 's/^!//') 2>/dev/null)
+		then
+			return 65
+		fi
+	fi
+	'cd' "$da"
+}