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April 5, 2023

Special Variables in Bash Shell [With Script Examples]
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Un petit rappel des variables spéciales de Bash.

Here's quick look into the special variables you get in bash shell:

Special Variable Description
$0 Gets the name of the current script.
$# Gets the number of arguments passed while executing the bash script.
$* Gives you a string containing every command-line argument.
$@ It stores the list of every command-line argument as an array.
$1-$9 Stores the first 9 arguments.
$? Gets the status of the last command or the most recently executed process.
$! Shows the process ID of the last background command.
$$ Gets the process ID of the current shell.
$- It will print the current set of options in your current shell.
bash script variable