Most code files are usually too large to 'cat' because of the context size limitations. Even if they fit within the context window, it's waste of API credits to provide it the information that it doesn't need.

Anyways posting this here isn't to get this particular problem solved. It is to see if there is a prompt that can solve it. And this is the only problem I found it not able to solve. It's not like it doesn't know about sed/awk/grep or other Linux tools, it is an expert on most of the common options involving them. My guess is there is something going on with this prompt that just breaks it's 'though patterns' for the lack of a better word :)