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#!/usr/bin/perl -w
use strict;
...
print "\n";
system("hostname");
print "\n";

_DATA_
diff /etc/group /etc/group.tmp
...
---
> sbo::18659:x0929,x1465,x1368,x5552::18659:x0929,v1x1465,x1368,x5552
bash-2.05#