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#!/usr/bin/env perl 
use strict;
...
print "First line of $file: $first";
close $infh;
exit;

$ ./fo.pl 
Could not open /no_such_file.txt: No such file or directory. Please pr
+ovide another:
...
Could not open foobar: No such file or directory. Please provide anoth
+er:
/etc/hosts
First line of /etc/hosts: 127.0.0.1        localhost.localdomain local
+host