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Special Parameters
Special shell parameters ($?, $*,...) may only be referenced;
assignment to them is not allowed.
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$* command-line arguments as one string
$@ command-line arguments as list of strings
(useful for writing wrapper shell scripts
that just add one argument)
$# number of command-line arguments
$? status of the most recently executed foreground
pipeline, i.e., the exit code of the last command
$$ process ID of the shell.
In a () subshell, it expands to the process ID
of the current shell, not the subshell.
$! process ID of the most recent background command
(after executed with &).
$0 name of the shell or shell script.
$- current option flags as specified upon invocation,
by the set command, or those set by the shell
itself (such as the -i option).
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