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→Creating & Executing Shell Scripts
Once you have planned your shell script by listing the sequence of steps in your script, you need to create a file that will contain your Linux commands. '''NOTE:''' Avoid using filenames of already existing Linux Commands to avoid confusion. Using shell script filenames that include the file extension of the shell that the script will run within is recommended.
If you are learning Bash scripting by reading other people’s code you might have noticed that the first line in the scripts starts with the #! characters and the path to the Bash interpreter.
This sequence of characters (#!) is called shebang and is used to tell the operating system which interpreter to use to parse the rest of the file. �Reference: https://linuxize.com/post/bash-shebang/
The shebang line must appear on the first line and at the beginning of the shell script, otherwise, it will be treated as a regular comment and ignored.
===Using Variables in Shell Scripts===