File: populateKeyword.pl

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#!/usr/bin/perl
sub usage {
  print "Usage: populateKeyword <keyword> <file>\n";
}

$keyword = shift or die usage();
$file = shift or die usage();

my $inMessage = 0;
while (<STDIN>) {
  if(index($_, "__END_".$keyword) != -1) {
    $inMessage = 0;
  }

  if(!$inMessage) {
    print $_;
  }

  $index = index($_, "__BEGIN_".$keyword);
  if($index != -1) {
    $inMessage = 1;
    $preLine = substr($_, 0, $index );
    open (FILE, $file);
    while (<FILE>) {
      print $preLine . $_;
    }
  }
}