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#!/usr/bin/perl -w
use strict;
...
touch( "dummy" ) or die "touch: $!";
ls( "dummy" ) or die "first ls: $!";
ls( "dummy" ) or die "second ls: $!";

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$ rm dummy
$ perl shell-test.pl
...
$ touch dummy
$ perl shell-test.pl
touch: Illegal seek at shell-test.pl line 6.