If you’re new to the world of the Linux command line, then you know how eye-openingly powerful it can be. In fact, the sky’s the limit with what you can do from the Command Line interface. But, ...

If you've used the command line much at all you know about I/O redirection for redirecting input to and/or output from a program. What you don't see all that often or that you may not be familiar with ...

The first line writes "hello world" to the file "output", the second reads it back and writes it to standard output (normally the terminal). A "here" document is essentially a temporary, nameless file ...