#!/bin/sh
#	HomeDir [user]...
#
# Produce a list of the home directories of the listed users.
# If no users are given, produce all home directories.

{	if [ $# -lt 1 ];then
		cat /etc/passwd
	else for u
		do	grep '^'$u':' /etc/passwd
		done
	fi
} | sed -e 's/.*:.*:.*:.*:.*:\(.*\):.*/\1/' |sort |uniq