Basics of Shell Programming

1. To get a Linux shell, you need to start a terminal.
2. To see what shell you have, run: echo $SHELL.
3. In Linux, the dollar sign ($) stands for a shell variable.
4. The ‘echo‘ command just returns whatever you type in.
5. The pipeline instruction (|) comes to rescue, when chaining several commands.
6. Linux commands have their own syntax, Linux won’t forgive you whatsoever is the mistakes. If you get a command wrong, you won’t flunk or damage anything, but it won’t work.
7. #!/bin/sh – It is called shebang. It is written at the top of a shell script and it passes the instruction to the program /bin/sh.