When I was young, I used cat and grep like that until an old Unix sys-admin remarked "What a gratuitous use of cat!". At the time, I did not understand what he

When I was young, I used cat and grep like that until an old Unix sys-admin remarked "What a gratuitous use of cat!". At the time, I did not understand what he meant, but now I do. So whenever I see cat and grep used like this, I think back to that lesson I learned.