MPE/iX Shell and Utilities Reference Manual, Vol 1

getopt(1) MPE/iX Shell and Utilities getopt(1)
Message: Unknown option "–option"
Cause: You specified an option that is not valid for getopt.
Action: Check the DESCRIPTION section of this man page for a list of valid getopt
options.
PORTABILITY
UNIX System V.
SEE ALSO
diff(1), getopts(1), sh(1)
Commands and Utilities 1-255