command line

Bash scripting foundation A Bash script is not a different kind of magic command. It is a text file that gives the shell a sequence of commands, values

Linux control flow A command can print reassuring output and still fail. Another command can finish silently and succeed. The shell does not decide from

A Linux command can read from your keyboard, print useful data to the terminal, report an error somewhere else, or send its output directly into another command.

You type ls -la into a terminal and a directory listing appears. It feels as if the terminal itself ran the command, but another program did the interpreting.