#!/bin/bash

# SIMPLE LIST HANDLING METHODS

function plist.add ()
# insert plist numbered item
{
        eval "function $1.set_$2 ()
        {
                eval \"function $1.$2 ()
                {
                        echo '\$@'
                }\"
        }"
        $1.set_$2 $3
}

function plist.show ()
# prints plist position item
{
        $1.$2 
}



# ADDITIONAL HELPER FUNCTIONS

function argp ()
# prints argument on position from string
{
        local ARGN=$1
        let   ARGN++
        echo  "${!ARGN}"
}



# MAIN PROGRAM SECTION

PSB=/bin/ps
PSG=`${PSB} -A -o user:32,group:32, --no-headers `



# EXAMPLE: FILL THE LIST WITH ITEMS...

PNU=0
while read PLN 
do
        let PNU++
        plist.add $PNU user  `argp 1 $PLN`
        plist.add $PNU group `argp 2 $PLN`
done <<< "$PSG" 



# GET SORTED LIST OF ACTIVE USERS AND GROUPS COMBINATIONS

PIN=0
while [ ! $PNU = $PIN ]
do
        let PIN++
        echo `plist.show $PIN user`:`plist.show $PIN group`
done | sort -u | grep ${1:-^\.\*\$}



exit 0

# vim:se nonu: