He's using <> so the original text file is implicitly opened if given on the cmd line. I guess you already knew, but you may have just overlooked it.
To be sure, just take his code and modify it like thus:
#!/usr/bin/perl -l
my @file = <>;
print 0+@file;
Indeed
$ ./bar.pl data.txt
46
$ wc data.txt
46 36 346 data.txt
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
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