[Bug 3115] New: Add --help

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3115

            Bug ID: 3115
           Summary: Add --help
           Product: Portable OpenSSH
           Version: 8.1p1
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: trivial
          Priority: P5
         Component: Documentation
          Assignee: unassigned-bugs at mindrot.org
          Reporter: jidanni at jidanni.org

Add a --help option to all the commands, as the one non-accidental way
to trigger the usage messages.

$ scp --help
$ ssh --help
etc.

Already works like
$ cat --help
except for the "unknown option" and error $? value.

$ ssh --help
unknown option -- -
usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface]
           [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]
           [-E log_file] [-e escape_char] [-F configfile] [-I pkcs11]
           [-i identity_file] [-J [user@]host[:port]] [-L address]
           [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p
port]
           [-Q query_option] [-R address] [-S ctl_path] [-W host:port]
           [-w local_tun[:remote_tun]] destination [command]
$ echo $?
255

Anyway, all other modern Unix commands have --help or -h etc. Yes, even
if they have man pages.

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