Question

I’m on an Ubuntu platform and have a directory containing many .py files and subdirectories (also containing .py files). I would like to add a line of text to the top of each .py file. What’s the easiest way to do that using Perl, Python, or shell script?

Answer 1

    #!/usr/bin/perl

    use Tie::File;
    for (@ARGV) {
        tie my @array, 'Tie::File', $_ or die $!; 
        unshift @array, "A new line";        
    }

To process all .py files in a directory recursively run this command in your shell:

find . -name '*.py' | xargs perl script.pl