distrib/sets/join.awk

   1 #       $NetBSD: join.awk,v 1.2 2002/05/19 13:32:44 lukem Exp $
   2 #
   3 # Copyright (c) 2002 The NetBSD Foundation, Inc.
   4 # All rights reserved.
   5 #
   6 # This code is derived from software contributed to The NetBSD Foundation
   7 # by Luke Mewburn of Wasabi Systems.
   8 #
   9 # Redistribution and use in source and binary forms, with or without
  10 # modification, are permitted provided that the following conditions
  11 # are met:
  12 # 1. Redistributions of source code must retain the above copyright
  13 #    notice, this list of conditions and the following disclaimer.
  14 # 2. Redistributions in binary form must reproduce the above copyright
  15 #    notice, this list of conditions and the following disclaimer in the
  16 #    documentation and/or other materials provided with the distribution.
  17 #
  18 # THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  19 # ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  20 # TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  21 # PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  22 # BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23 # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24 # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25 # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26 # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27 # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  28 # POSSIBILITY OF SUCH DAMAGE.
  29 #
  30 # join.awk F1 F2
  31 #       Similar to join(1), this reads a list of words from F1
  32 #       and outputs lines in F2 with a first word that is in F1.
  33 #       Neither file needs to be sorted
  34
  35 BEGIN \
  36 {
  37         if (ARGC != 3) {
  38                 printf("Usage: join file1 file2\n") >"/dev/stderr"
  39                 exit 1
  40         }
  41         while ( (getline < ARGV[1]) > 0)
  42                 words[$1] = $0
  43         delete ARGV[1]
  44 }
  45
  46 $1 in words \
  47 {
  48         f1=$1
  49         $1=""
  50         print words[f1] $0
  51 }