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.\"	@(#)passwd.1	8.1 (Berkeley) 6/6/93
.\"
.Dd June 6, 1993
.Dt PASSWD 1
.Os BSD 4
.Sh NAME
.Nm passwd
.Nd modify a user's password
.Sh SYNOPSIS
.Nm passwd
.Op Fl i Ar infosystem
.Op Fl l Ar location
.Op Fl u Ar authname
.Op Ar name
.Sh DESCRIPTION
.Nm 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 detect (and avoid accepting) typing errors.
.Pp
The new password should be at least six characters long
and not purely alphabetic.
Its total length should be less than
.Dv _PASSWORD_LEN
(currently 128 characters),
although some infosystems allow longer passwords.
Numbers, upper-case letters, and meta characters
are encouraged.
.Pp
Once the password has been verified,
.Nm passwd
communicates the new password information to
the authenticating host.
.Bl -tag -width flag
.It Fl i Ar infosystem
This option specifies where the password update should be applied.
Under Mac OS X 10.5, supported infosystems are:
.Bl -tag -width flag
.It Ar opendirectory
(default)
A system conforming to opendirectory APIs and supporting updates
(including LDAP, etc).
If no -l option is specified, the search node is used.
.It Ar file
The local flat-files (included for legacy configurations).
.It Ar nis
A remote NIS server containing the user's password.
.El
.It Fl l Ar location
This option causes the password to be updated in the given location
of the chosen infosystem.
.Bl -tag -width flag
.It for file,
location may be a file name (/etc/master.passwd is the default)
.It for nis,
location may be a NIS domainname
.It for opendirectory,
location may be a directory node name
.El
.It Fl u Ar authname
This option specifies the username to use when authenticating to
the directory node.
.El
.Pp
The super-user privileges are not required
to change a user's current password,
if only the local password is modified.
.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 dscl 1 ,
.Xr passwd 5 ,
.Xr pwd_mkdb 8 ,
.Xr vipw 8
.Rs
.%A Robert Morris
.%A Ken Thompson
.%T "UNIX password security"
.Re
.Sh HISTORY
A
.Nm passwd
command appeared in
.At v6 .