How about: 
    my $infileold = $ARGV[0] || $fileold;
    my $infilenew = $ARGV[1] || $filenew;

[download]
Or, if you want to get rid of those args from @ARGV, you could use shift: 
    my $infileold = shift || $fileold;
    my $infilenew = shift || $filenew;

[download]

In reply to Re: Defaults for command line args by btrott
in thread Defaults for command line args by ChuckularOne

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