\" $NetBSD: passwd.1,v 1.28 2006/03/07 01:52:09 hubertf Exp $

\" $NetBSD: passwd.1,v 1.28 2006/03/07 01:52:09 hubertf Exp $
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\" from: @(#)passwd.1 8.1 (Berkeley) 6/6/93
\"
Dd February 25, 2005
Dt PASSWD 1
Os
Sh NAME
Nm passwd
Nd modify a user's password
Sh SYNOPSIS
Nm
Op Ar user
Nm
Oo Fl d Ar files | Fl l Oc
Op Ar user
Nm
Oo Fl d Ar nis | Fl y Oc
Op Ar user
Nm
Oo Fl d Ar krb5 | Fl k Oc
Op Ar principal
Sh DESCRIPTION
Nm
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.
Pp
The new password should be at least six characters long and not
purely alphabetic.
Its total length must be less than
Dv _PASSWORD_LEN
(currently 128 characters).
Numbers, upper case letters and meta characters
are encouraged.
Pp
All options may not be available on all systems.
Bl -tag -width flag
It Fl d Ar database
This option specifies the password database that should be updated. The
following databases are supported:
Bl -tag -width files
It files
This specifies that the password change should be applied to the local
password file.
When changing only the local password,
Nm
uses
Xr pwd_mkdb 8
to update the password databases.
It nis
This specifies that the password change should be applied to the NIS
password database.
The
Xr rpc.yppasswdd 8
daemon should be running on the master NIS server.
It krb5
This specifies that the user's Kerberos 5 password should be changed.
The host must be configured to use Kerberos.
See
Xr krb5.conf 5 .
El
It Fl l
This is the equivalent of
Fl d Ar files .
It Fl y
This is the equivalent of
Fl d Ar nis .
It Fl k
This is the equivalent of
Fl d Ar krb5 .
El
Pp
If a password database is not specified,
Nm
will change the password database as determined by the
Pluggable Authentication Module
Pq PAM
library.
Pp
The type of cipher used to encrypt the password depends on the configuration
in
Xr passwd.conf 5 .
It can be different for local and NIS passwords.
Sh FILES
Bl -tag -width /etc/master.passwd -compact
It Pa /etc/master.passwd
The user database
It Pa /etc/passwd
A Version 7 format password file
It Pa /etc/passwd.XXXXXX
Temporary copy of the password file
El
Sh SEE ALSO
Xr chpass 1 ,
Xr login 1 ,
Xr pwhash 1 ,
Xr passwd 5 ,
Xr passwd.conf 5 ,
Xr pam 8 ,
Xr pwd_mkdb 8 ,
Xr vipw 8
Rs
%A Robert Morris
%A Ken Thompson
%T "UNIX password security"
Re
Sh HISTORY
A
Nm
command appeared in
At v6 .