arguments are given.
Note that usage() and the manpage disagree...
PR: bin/6294
Suggested by: Ruslan Ermilov and Bruce Evans
Submitted by: Ruslan Ermilov (partly)
null-terminated.
Fixed a wrong if statement which should test a string is
empty where in fact it tested the string pointer was NULL.
Should go to RELENG_2_1 and RELENG_2_2.
Reviewed by guido@freebsd.org.