appjail-usage
—
Display the syntax of a given command
Shows the syntax of the given command.
The appjail usage
utility exits 0
on success, and >0 if an error occurs. It may fail for one of the
following reasons:
- EX_USAGE:
The command was not specified.
- EX_NOINPUT:
The command does not exist.
- EX_SOFTWARE:
The function responsible for displaying the usage message is not
implemented.