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#!/usr/bin/perl -i
use strict;
use warnings;
my $z = 0;
# read stdin and any/all files passed as parameters one line at a time
while (<>) {
# if we find a Z word, save it
$z = $1 if /Z\s*(\d+(\.\d+)?)/;
# if we don't have Z, but we do have X and Y
if (!/Z/ && /X/ && /Y/ && $z > 0) {
# chop off the end of the line (incl. comments), saving chopped section in $1
s/\s*([\r\n\;\(].*)/" Z$z $1"/es;
# print start of line, insert our Z value then re-add the chopped end of line
# print "$_ Z$z $1";
}
#else {
# nothing interesting, print line as-is
print or die $!;
#}
}
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