I haven't seriously written in Perl for at least 5 years so I don't know about what packages are available.
Still, he would have to write the script. Debug the script (probably nobody except you writes code that works perfectly the first time.) Test the script a lot if it is going to be used in a production run.
Or if this is infrequent use, he could spend less than a hundred bucks for a program that works rather well, and skip some days work and spend 20 minutes here and there.
I like to build custom tools. It isn't always practical, though usually fun. Whatever.