extra/scripts/getent

   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"
  12 export PATH
  13
  14 file="/etc/$1"
  15 case $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: $1" 1>&2
  31                 exit 1 ;;
  32 esac
  33
  34 if [ ! -f "$file" ] ; then
  35         echo "$0: Could not find database file for $1" 1>&2
  36         exit 1
  37 fi
  38
  39 if [ $# -eq 1 ] ; then
  40         exec cat "$file"
  41 else
  42         sed "s/#.*//; /$match/q; d" "$file" | grep . || exit 2
  43 fi