PASSWD(1) | General Commands Manual | PASSWD(1) |
passwd
— modify a
user's password
passwd |
[user] |
passwd |
[-d files |
-l ] [user] |
passwd |
[-d nis |
-y ] [user] |
passwd |
[-d krb5 |
-k ] [principal] |
passwd
changes the user's password. First,
the user is prompted for their current password. If the current password is
correctly 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 encouraged.
All options may not be available on all systems.
-d
databasepasswd
uses
pwd_mkdb(8) to update
the password databases.-l
-d
files.-y
-d
nis.-k
-d
krb5.If a password database is not specified,
passwd
will change the password database as
determined by the Pluggable Authentication Module (PAM) library.
The type of cipher used to encrypt the password depends on the configuration in passwd.conf(5). It can be different for local and NIS passwords.
chpass(1), login(1), pwhash(1), passwd(5), passwd.conf(5), pam(8), pwd_mkdb(8), vipw(8)
Robert Morris and Ken Thompson, UNIX password security.
A passwd
command appeared in
Version 6 AT&T UNIX.
February 25, 2005 | NetBSD 10.99 |