- `$ checksums.sh -help` ``` /usr/bin/basename: illegal option -- h usage: basename string [suffix] basename [-a] [-s suffix] string [...] mdls: unrecognized option `-help' /usr/bin/stat: illegal option -- h usage: stat [-FlLnqrsx] [-f format] [-t timefmt] [file ...] (standard_in) 1: parse error (standard_in) 1: parse error ``` - `checksums.sh --help` ``` /usr/bin/basename: illegal option -- - usage: basename string [suffix] basename [-a] [-s suffix] string [...] mdls: unrecognized option `--help' /usr/bin/stat: illegal option -- - usage: stat [-FlLnqrsx] [-f format] [-t timefmt] [file ...] (standard_in) 1: parse error (standard_in) 1: parse error ``` - `checksums.sh` (no parameter) ``` stat: : stat: No such file or directory (standard_in) 1: parse error (standard_in) 1: parse error ```