Many commands take options to modify their behavior, following these rules
(similar to UNIX conventions, but not identical):
- All options must be immediately preceded by '-'.
- Options may be grouped after a single '-'.
- Some options may take string, numeric, or time arguments. There must
be no space between the option and the argument.
- String option-arguments may be delimited by a space, double quotes,
single quotes, or backquotes.
- A literal delimiter character or '\' within a delimited string must
be escaped by preceding it with '\'.
- All options must precede normal arguments.
- A '-' or '--' by itself may be used to mark the end of the options.
This is useful when the first regular argument begins with '-'.
- A '-?' or invalid option will produce a list of valid options.
See also: getopts().
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Copyright © 1995 - 1999 Ken Keys