I know what it does, but how is it useful? Maybe I didn't really read it right but "The grep command searches for a patern of characters in a file or multiple files" So if you already know what files you are looking in to find your characters why would grep be useful?

I think I figured it out. It's like if
you thought there was an error in a passwd file you could use grep to try to find the file. Am I close.
D, world destruction
Over and overture
N, do I need
Apostrophe T, need this torture?-They Might Be Giants