recursive ypmatch aliases

[Daniel P. Kionka]

This is a useful utility for sites that have very hierarchial mail
aliases.  To find out who is included in an alias, run this script with
the alias name as a parameter.  (Multiple alias names will produce
strange results.)  In some companies, you can even use the output as a
simple organizational chart.

------------------------------------------------------------------------
#! /bin/sh

# rec-al -- recursive aliases
# ---------------------------
#
# Usage:  rec-al alias-name
#
# This program recursively expands mail aliases with "ypmatch".  If your
# aliases are not maintained by yellow pages or you do not have the ypmatch
# utility, this program is worthless.
#
# This program runs very slowly, so it is probably best used to create
# a file that you use later.  The output is ideal for greps or further
# shell script processing.
#
# It runs slowly because it uses recursive shell scripts and (if I
# understand YP) lots of network calls.  A much faster version could be
# written with "ypcat -k aliases" and perhaps awk, if someone wants a
# challenge.
#
# Written by Daniel P. Kionka, released to the public domain.


# Verify parameters

if [ $# -lt 1 ]
then
	echo Usage: $0 alias
fi

name=$1
# to reverse the order, remove the shift and make parents="$*"
shift
parents="$* $name"

list=`ypmatch $name aliases 2> /dev/null`
if [ $? -eq 0 ]
then
	list=`echo $list | sed 's/,//g'`
	for n in $list
	do
		# Recursive call ...
		$0 $n $parents
	done
else
	# To print the leaves only, use "echo $name"
	echo $parents
fi
-- 
Daniel P. Kionka			Cadence Design Systems, Inc.
dank at sda.UUCP				San Jose, CA 95134