#!/bin/sh

set -e
set -u

export PATH='/bin:/sbin:/usr/bin:/usr/sbin'

IFS=':'

getent passwd | while read name password uid gid gecos home shell
do
	group=$(id -g -n "$name" 2>'/dev/null' || :)
	extra=$(id -G -n "$name" 2>'/dev/null' \
	    | tr ' ' '\n'                      \
	    | grep -v "^$group$"               \
	    | tr '\n' ' ')
	extra=${extra% }

	echo "U:$name:$uid:$group:$gecos:$home:$shell:$extra"
done

getent group | while read name password gid members
do
	echo "G:$name:$gid"
done

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