- REQUIRE_ORDER means don't recognize them as options;
- stop option processing when the first non-option is seen.
- This is what Unix does.
- This mode of operation is selected by either setting the environment
- variable POSIXLY_CORRECT, or using '+' as the first character
- of the list of option characters, or by calling getopt.
-
- PERMUTE is the default. We permute the contents of ARGV as we
- scan, so that eventually all the non-options are at the end.
- This allows options to be given in any order, even with programs
- that were not written to expect this.
+ PERMUTE means permute the contents of ARGV as we scan, so that
+ eventually all the non-options are at the end. This allows options
+ to be given in any order, even with programs that were not written
+ to expect this.