I would write it like this - making some assumptions as your two versions do (slightly) different things: 

#!/usr/bin/perl -w
use strict;
use File::Copy;

while (<>) {
    if (/^hostname/) {
        chomp;
        # substr($_,9) extracts everything after 'hostname '
        copy ($ARGV, substr($_, 9));
        close(ARGV);
    }
}

[download]
If this script is saved as 'hostname.pl' you call it something like hostname.pl 10.* and let the shell handle the filename globbing.

-- Hofmator

In reply to Re: A question of efficiency by Hofmator
in thread A question of efficiency by c

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