Bash: Let me bash that for you, Part 1

Let's get the next dan of bash with the text processing.

The 1st note is the greatest idea of the whole unix is in that everything is file - classic file, directory, devices, file systems and so on.

Many commands expects the file for its input or it could be a simple standard input also known as stdin (refers as stream #0).

As well many commands put their output to standard output aka stdout (refers as stream #1) or to standard error output aka stderr (refers as stream #2).

There are several key text processing command and several techniques like stream redirection.

And once more! the most powerful command is man means manual.