Many Linux programs are the complete opposite: they require input and produce output. Often, these programs modify their input in some way, and there are plenty of them: cut, head, sort, uniq, etc.

Running commands in the Linux terminal is likely something you do nearly every day, but moving a running process into the “background” and later moving it back into the “foreground” is ...

Input Redirection. The ‘<’ sign is used for the input or stdin redirection. For example, Linux’s mail program sends emails from your Linux terminal. You can type the email contents with the standard ...