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Update 'computing_shell_scripts'

Blake Leverington 2022-05-05 13:25:47 +02:00
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computing_shell_scripts.md

@ -12,3 +12,15 @@ There are several flavours of Linux shells. Bash is one of the most common.
- [Bash scripting cheatsheet](https://devhints.io/bash) - [Bash scripting cheatsheet](https://devhints.io/bash)
- [30 Bash script examples](https://linuxhint.com/30_bash_script_examples/) - [30 Bash script examples](https://linuxhint.com/30_bash_script_examples/)
- [Bash Scripting Tutorial for beginners](https://linuxconfig.org/bash-scripting-tutorial-for-beginners) - [Bash Scripting Tutorial for beginners](https://linuxconfig.org/bash-scripting-tutorial-for-beginners)
## variables in a bash script
$0 - The name of the Bash script.
$1 - $9 - The first 9 arguments to the Bash script. (As mentioned above.)
$# - How many arguments were passed to the Bash script.
$ - All the arguments supplied to the Bash script.
$ - The exit status of the most recently run process.
$$ - The process ID of the current script.
$USER - The username of the user running the script.
$HOSTNAME - The hostname of the machine the script is running on.
$SECONDS - The number of seconds since the script was started.
$RANDOM - Returns a different random number each time is it referred to.