passwd(1)
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PASSWD(1) NetBSD Reference Manual PASSWD(1)
NAME
passwd, yppasswd - modify a user's password
SYNOPSIS
passwd [-l] [-y] [user]
yppasswd [user]
DESCRIPTION
passwd changes the user's local or YP password. First, the user is
prompted for their current password. If the current password is correct-
ly typed, a new password is requested. The new password must be entered
twice to avoid typing errors.
The new password should be at least six characters long and not purely
alphabetic. Its total length must be less than _PASSWORD_LEN (currently
128 characters). Numbers, upper case letters and meta characters are en-
couraged.
-l This option causes the password to be updated only in the local
password file. When changing only the local password, pwd_mkdb(8)
is used to update the password databases.
-y This forces the YP password database entry to be changed, even if
the user has an entry in the local database. The rpc.yppasswdd(8)
daemon should be running on the YP master server. yppasswd is the
equivalent of passwd with the -y flag.
This is the behavior if no flags are specified: If the password is not in
the YP database, then an attempt is made to use the local password
database. The super-user is not required to provide a user's current
password if only the local password is modified.
FILES
/etc/master.passwd The user database
/etc/passwd A Version 7 format password file
/etc/passwd.XXXXXX Temporary copy of the password file
SEE ALSO
chpass(1), login(1), passwd(5), pwd_mkdb(8), vipw(8)
Robert Morris, and Ken Thompson, UNIX password security.
HISTORY
A passwd command appeared in Version 6 AT&T UNIX.
NetBSD 1.4 June 6, 1993 1
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