Wow. Thank you for explaining this! I'd never understood why `cat` was called useless when (so far as I then knew) there was no other way to "start a left-to-ri

Wow. Thank you for explaining this! I'd never understood why `cat` was called useless when (so far as I then knew) there was no other way to "start a left-to-right pipe by reading from a file" (other than the aforementioned `grep <filename> *`). This helps!