I'd have gone for "can't use perl, that's obsolete (uses awk instead)" which is kind of ironic if you remember the days of a2p. As it is, a combination of sh/aw

I'd have gone for "can't use perl, that's obsolete (uses awk instead)" which is kind of ironic if you remember the days of a2p. As it is, a combination of sh/awk will do the job, but is likely slower and less flexible than doing it in perl because this is exactly the sort of job perl was designed for, back in the day.