[Bug 252644] ifconfig 'usage' does not match man page synopsis

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252644

            Bug ID: 252644
           Summary: ifconfig 'usage' does not match man page synopsis
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: ghuckriede at blackberry.com

Created attachment 221537
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=221537&action=edit
Possible patch

'ifconfig' displayed usage is incomplete and does not match the synopsis in the
man page. 

Steps to Reproduce: 
Execute 'ifconfig' with invalid options and compare with man page synopsis.

Actual Results: 
root at FreeBSD_head:/usr/src # ifconfig -Z
ifconfig: illegal option -- Z
usage: ifconfig [-f type:format] [-g groupname] [-C] [-L] interface
address_family
                [address [dest_address]] [parameters]
       ifconfig interface create
       ifconfig -a [-g groupname] [-C] [-L] [-d] [-m] [-u] [-v]
[address_family]
       ifconfig -l [-d] [-u] [address_family]
       ifconfig [-g groupname] [-C] [-L] [-d] [-m] [-u] [-v]
root at FreeBSD_head:/usr/src # 

Expected Results:
root at FreeBSD_head:/usr/src # ifconfig -Z
ifconfig: illegal option -- Z
usage: ifconfig [-f type:format[,type:format]] [-L] [-k] [-m] [-n] interface
                [create] address_family [address [dest_address]] [parameters]
       ifconfig interface destroy
       ifconfig -a [-L] [-d] [-g groupname] [-m] [-u] [-v] [address_family]
       ifconfig -l [-d] [-u] [address_family]
       ifconfig [-L] [-d] [-k] [-m] [-u] [-v] [-C]
       ifconfig [-g groupname]
root at FreeBSD_head:/usr/src # 
N.B.Patched ifconfig is displayed and matches the man page synopsis.

Build Date & Hardware: 
root at FreeBSD_head:/usr/src # uname -a
FreeBSD FreeBSD_head 13.0-CURRENT FreeBSD 13.0-CURRENT #5 r369005: Wed Jan 13
10:20:13 EST 2021    
root at FreeBSD_head:/usr/obj/usr/src/amd64.amd64/sys/GENERIC  amd64

Additional Information:

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