1#!/bin/sh
2#
3# Closely (not perfectly) emulate the behavior of glibc's getent utility
4#
5#passwd|shadow|group|aliases|hosts|networks|ethers|netgroup|protocols|services|rpc
6# only returns the first match (by design)
7# dns based search is not supported (hosts,networks)
8# case-insensitive matches not supported (ethers; others?)
9# may return false-positives (hosts,protocols,rpc,services,ethers)
10
11[ -z "$PATH" ] && PATH="/bin:/usr/bin" || PATH="${PATH}:/bin:/usr/bin"
12export PATH
13
14file="/etc/$1"
15case $1 in
16	passwd|group)
17		match="^$2:\|^[^:]*:[^:]*:$2:" ;;
18	shadow)
19		match="^$2:" ;;
20	networks|netgroup)
21		match="^[[:space:]]*$2\>" ;;
22	hosts|protocols|rpc|services|ethers)
23		match="\<$2\>" ;;
24	aliases)
25		match="^[[:space:]]*$2[[:space:]]*:" ;;
26	""|-h|--help)
27		echo "USAGE: $0 database [key]"
28		exit 0 ;;
29	*)
30		echo "$0: Unknown database: $1" 1>&2
31		exit 1 ;;
32esac
33
34if [ ! -f "$file" ] ; then
35	echo "$0: Could not find database file for $1" 1>&2
36	exit 1
37fi
38
39if [ $# -eq 1 ] ; then
40	exec cat "$file"
41else
42	sed "s/#.*//; /$match/q; d" "$file" | grep . || exit 2
43fi
44