> cat just outputs file contents Well it does but... its actual purpose is to concatenate multiple files. All Unix commands can read files so you don't need a

> cat just outputs file contents Well it does but... its actual purpose is to concatenate multiple files. All Unix commands can read files so you don't need any special tools for that. E.g. grep "^\s*fn\s" < main.rs | wc -l or in grep's specific case just grep "^\s*fn\s" main.rs | wc -l