Say my code is:
# PRO1.pl
open (MYFILE, 'data.txt');
while (<MYFILE>) {
chomp;
print "$_\n";
}
close (MYFILE);

But I want to run all these from this PRO1.pl program

$ perl PRO1.pl part1.txt
$ perl PRO1.pl part2.txt
$ perl PRO1.pl part3.txt

What do I change 'data.txt' so I can use any text file with this program.

I know I can be change it to a variable
$fileName='data.txt'
open (MYFILE, $fileName);

But how do I get a parameter into the program so that it will open the parameter file and not the variable file.

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