In bash, special variables are predefined variables that provide information about the script's execution environment. Here are some commonly used special variables:
$0: The name of the script.$1,$2,$3, etc.: The first, second, third command-line arguments passed to the script.$@: All command-line arguments passed to the script as a single word.$#: The number of command-line arguments passed to the script.$$: The process ID of the current shell or script.$?: The exit status of the last command executed.
These variables are useful for handling input and controlling the flow of scripts.
