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To start/stop/restart/status samba, you use the command: /usr/sbin/samba action where action is start or stop or restart or status. However, the Usage clause refers to the command smb, which does not exist. The Usage clause should say: Usage: samba {start|stop|restart|status}
Actually, the '/usr/sbin/samba' is just a copy of the /etc/rc.d/init.d/smb script, which explains the message. In any case, a quick cosmetic fix will be in the next Raw Hide samba package.