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for $file(@ARGV)
{
...
    }
    close(FHF);
}

The null filehandle <> is special: it can be used to emulate the behav
+ior of sed and awk. Input from <> comes either from standard input, o
+r from each file listed on the command line. Here's how it works: the
+ first time <> is evaluated, the @ARGV array is checked, and if it is
+ empty, $ARGV[0] is set to ``-'', which when opened gives you standar
+d input. The @ARGV array is then processed as a list of filenames. Th
+e loop

...

    }