As plaid said, just add the filename(s) as arguments (space delimited) after the program name.

Example:

program.pl file1 file2 file3
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The array @ARGV contains the command line arguments intended for the program. To get the filename or filenames you simply get it from your @ARGV array as follows:

my $file = shift(@ARGV); # for one file
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or

my @files = @ARGV;       # for more than one file
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You can then do whatever you need to with the file names.