.\" $NetBSD: usermod.8,v 1.34 2014/09/19 16:04:29 wiz Exp $ */
.\"
.\" Copyright (c) 1999 Alistair G. Crooks.  All rights reserved.
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.Dd January 13, 2009
.Dt USERMOD 8
.Os
.Sh NAME
.Nm usermod
.Nd modify user login information
.Sh SYNOPSIS
.Nm
.Op Fl FmoSv
.Op Fl C Ar yes/no
.Op Fl c Ar comment
.Op Fl d Ar home-dir
.Op Fl e Ar expiry-time
.Op Fl f Ar inactive-time
.Op Fl G Ar secondary-group
.Op Fl g Ar gid | name | Li =uid
.Op Fl L Ar login-class
.Op Fl l Ar new-login
.Op Fl p Ar password
.Op Fl s Ar shell
.Op Fl u Ar uid
.Ar user
.Sh DESCRIPTION
The
.Nm
utility modifies user login information on the system.
.Pp
Default values are taken from the information provided in the
.Pa /etc/usermgmt.conf
file, which, if running as root, is created using the built-in defaults if
it does not exist.
.Pp
See
.Xr user 8
for more information about
.Dv EXTENSIONS .
.Pp
After setting any defaults, and then reading values from
.Pa /etc/usermgmt.conf ,
the following command line options are processed:
.Bl -tag -width Ds
.It Fl C Ar yes/no
Enable user accounts to be temporary locked/closed.
The
.Ar yes/no
operand can be given as
.Dq Ar yes
to lock the account or
.Dq Ar no
to unlock the account.
.It Fl c Ar comment
Set the comment field (also, for historical reasons known as the
GECOS field) for the user.
The comment field will typically include
the user's full name and, perhaps, contact information for the user.
.It Fl d Ar home-directory
Set the home directory without populating it; if the
.Fl m
option is specified, tries to move the old home directory to
.Ar home-directory .
.It Fl e Ar expiry-time
Set the time at which the account expires.
This can be used to implement password aging.
It should be entered in the form
.Dq month day year ,
where month is the month name (the first three characters are
sufficient), day is the day of the month, and year is the year.
Time in seconds since the epoch (UTC) is also valid.
A value of 0 can be used to disable this feature.
This value can be preset for all users using the
.Ar expire
field in the
.Pa /etc/usermgmt.conf
file.
See
.Xr usermgmt.conf 5
for more details.
.It Fl F
Force the user to change their password upon next login.
.It Fl f Ar inactive-time
Set the time at which the password expires.
See the
.Fl e
option.
.It Fl G Ar secondary-group
Specify a secondary group to which the user will be added in the
.Pa /etc/group
file.
The
.Ar secondary-group
may be a comma-delimited list for multiple groups.
Or the option may be repeated for multiple groups.
(16 groups maximum.)
.It Fl g Ar gid | name | Li =uid
Give the group name or identifier to be used for the user's primary group.
If this is
.Ql =uid ,
then a uid and gid will be picked which are both unique
and the same, and a line will be added to
.Pa /etc/group
to describe the new group.
This value can be preset for all users by using the
.Ar group
field in the
.Pa /etc/usermgmt.conf
file.
See
.Xr usermgmt.conf 5
for more details.
.It Fl L Ar login-class
Set the login class for the user.
See
.Xr login.conf 5
for more information on user login classes.
This value can be preset for all users by using the
.Ar class
field in the
.Pa /etc/usermgmt.conf
file.
See
.Xr usermgmt.conf 5
for more details.
This option is included if built with
.Dv EXTENSIONS .
.It Fl l Ar new-user
Give the new user name.
It can consist of alphanumeric characters and the characters
.Ql \&. ,
.Ql \&- ,
and
.Ql \&_ .
.It Fl m
Move the home directory from its old position to the new one.
If
.Fl d
is not specified, the
.Ar new-user
argument of the
.Fl l
option is used; one of
.Fl d
and
.Fl l
is needed.
.It Fl o
Allow duplicate uids to be given.
.It Fl p Ar password
Specify an already-encrypted password for the user.
This password can then be changed by using the
.Xr chpass 1
utility.
This value can be preset for all users by using the
.Ar password
field in the
.Pa /etc/usermgmt.conf
file.
See
.Xr usermgmt.conf 5
for more details.
This option is included if built with
.Dv EXTENSIONS .
.It Fl S
Allow samba user names with a trailing dollar sign to be modified.
This option is included if built with
.Dv EXTENSIONS .
.It Fl s Ar shell
Specify the login shell for the user.
This value can be preset for all users by using the
.Ar shell
field in the
.Pa /etc/usermgmt.conf
file.
See
.Xr usermgmt.conf 5
for more details.
.It Fl u Ar uid
Specify a new uid for the user.
Boundaries for this value can be preset for all users by using the
.Ar range
field in the
.Pa /etc/usermgmt.conf
file.
See
.Xr usermgmt.conf 5
for more details.
.It Fl v
Enable verbose mode - explain the commands as they are executed.
This option is included if built with
.Dv EXTENSIONS .
.El
.Pp
Once the information has been verified,
.Nm
uses
.Xr pwd_mkdb 8
to update the user database.
This is run in the background.
At very large sites this can take several minutes.
Until this update
is completed, the password file is unavailable for other updates
and the new information is not available to programs.
.Sh FILES
.Bl -tag -width /etc/usermgmt.conf -compact
.It Pa /etc/usermgmt.conf
.El
.Sh EXIT STATUS
.Ex -std usermod
.Sh SEE ALSO
.Xr chpass 1 ,
.Xr group 5 ,
.Xr passwd 5 ,
.Xr usermgmt.conf 5 ,
.Xr pwd_mkdb 8 ,
.Xr user 8 ,
.Xr useradd 8 ,
.Xr userdel 8
.Sh HISTORY
The
.Nm
utility first appeared in
.Nx 1.5 .
It is based on the
.Ar addnerd
package by the same author.
.Sh AUTHORS
The
.Nm
utility was written by
.An Alistair G. Crooks
.Aq agc@NetBSD.org .