-o      Do not automatically override the password authentication checks
             for the super-user on the NIS master server; assume 'old' mode
     -o      Do not automatically override the password authentication checks
             for the super-user on the NIS master server; assume 'old' mode
PASSWD(1)               FreeBSD General Commands Manual              PASSWD(1)
NAME
     passwd, yppasswd -- modify a user's password
SYNOPSIS
     passwd [-l] [user]
     yppasswd [-l] [-y] [-d domain] [-h host] [-o]
FreeBSD 6.2                      June 6, 1993                      FreeBSD 6.2
FreeBSD 6.2                      June 6, 1993                      FreeBSD 6.2
     When entering the new password, the characters entered do not echo, in
     order to avoid the password being seen by a passer-by.  The passwd util-
     ity prompts for the new password twice in order to detect typing errors.
     The new password should be at least six characters long (which may be
     overridden using the login.conf(5) ``minpasswordlen'' setting for a
     user's login class) and not purely alphabetic.  Its total length must be
     less than _PASSWORD_LEN (currently 128 characters).
...skipping...
             instead.  This flag is of limited practical use but is useful for
             testing.
FILES
     /etc/master.passwd  the user database
     /etc/passwd         a Version 7 format password file
     /etc/passwd.XXXXXX  temporary copy of the password file
     /etc/login.conf     login class capabilities database
     /etc/auth.conf      configure authentication services
SEE ALSO
     chpass(1), kinit(1), login(1), login.conf(5), passwd(5), kerberos(8),
     kpasswdd(8), pw(8), pwd_mkdb(8), vipw(8)
     Robert Morris and Ken Thompson, UNIX password security.
NOTES
     The yppasswd command is really only a link to passwd.
HISTORY
     A passwd command appeared in Version 6 AT&T UNIX.
FreeBSD 6.2                      June 6, 1993                      FreeBSD 6.2