shadow/man/usermod.8

.\"$Id: usermod.8,v 1.15 2003/10/21 20:13:11 kloczek Exp $
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.TH USERMOD 8
.SH NAME
usermod \- Modify a user account
.SH SYNOPSIS
.TP 8
\fBusermod\fR [\fB-c\fR \fIcomment\fR] [\fB-d\fR \fIhome_dir\fR [\fB-m\fR]]
.br
[\fB-e\fR \fIexpire_date\fR] [\fB-f\fR \fIinactive_time\fR]
.br
[\fB-g\fR \fIinitial_group\fR] [\fB-G\fR \fIgroup\fR [,...]]
.br
[\fB-l\fR \fIlogin_name\fR] [\fB-p\fR \fIpasswd\fR]
.br
[\fB-s\fR \fIshell\fR] [\fB-u\fR \fIuid\fR [\fB-o\fR]] [\fB-L\fR|\fB-U\fR]
\fIlogin\fR
.SH DESCRIPTION
The \fBusermod\fR command modifies the system account files to reflect the
changes that are specified on the command line. The options which apply to
the \fBusermod\fR command are:
.IP "\fB-c\fR \fIcomment\fR"
The new value of the user's password file comment field. It is normally
modified using the \fBchfn\fR(1) utility.
.IP "\fB-d\fR \fIhome_dir\fR"
The user's new login directory. If the \fB-m\fR option is given the contents
of the current home directory will be moved to the new home directory, which
is created if it does not already exist.
.IP "\fB-e\fR \fIexpire_date\fR"
The date on which the user account will be disabled. The date is specified
in the format \fIYYYY-MM-DD\fR.
.IP "\fB-f\fR \fIinactive_days\fR"
The number of days after a password expires until the account is permanently
disabled. A value of 0 disables the account as soon as the password has
expired, and a value of -1 disables the feature. The default value is -1.
.IP "\fB-g\fR \fIinitial_group\fR"
The group name or number of the user's new initial login group. The group
name must exist. A group number must refer to an already existing group.
The default group number is 1.
.IP "\fB-G\fR \fIgroup,[...]\fR"
A list of supplementary groups which the user is also a member of. Each
group is separated from the next by a comma, with no intervening whitespace.
The groups are subject to the same restrictions as the group given with the
\fB-g\fR option. If the user is currently a member of a group which is not
listed, the user will be removed from the group.
.IP "\fB-l\fR \fIlogin_name\fR"
The name of the user will be changed from \fIlogin\fR to \fIlogin_name\fR.
Nothing else is changed. In particular, the user's home directory name
should probably be changed to reflect the new login name.
.IP "\fB-p\fR \fIpasswd\fR"                                                
The encrypted password, as returned by \fBcrypt\fR(3).
.IP "\fB-s\fR \fIshell\fR"
The name of the user's new login shell. Setting this field to blank causes
the system to select the default login shell.
.IP "\fB-u\fR \fIuid\fR"
The numerical value of the user's ID. This value must be unique, unless the
\fI-o\fR option is used. The value must be non-negative. Values between 0
and 99 are typically reserved for system accounts. Any files which the user
owns and which are located in the directory tree rooted at the user's home
directory will have the file user ID changed automatically. Files outside of
the user's home directory must be altered manually.
.IP "\fB-L\fR"
Lock a user's password. This puts a '!' in front of the encrypted password,
effectively disabling the password.  You can't use this option with \fI-p\fR
or \fI-U\fR.
.IP "\fB-U\fR"
Unlock a user's password. This removes the '!' in front of the encrypted
password. You can't use this option with \fI-p\fR or \fI-L\fR.
.SH CAVEATS
\fBusermod\fR will not allow you to change the name of a user who is
logged in. You must make certain that the named user is not executing any
processes when this command is being executed if the user's numerical user
ID is being changed. You must change the owner of any crontab files
manually. You must change the owner of any at jobs manually. You must make
any changes involving NIS on the NIS server.
.SH FILES
\fI/etc/passwd\fR \	- user account information
.br
\fI/etc/shadow\fR \	- secure user account information
.br
\fI/etc/group\fR \	- group information
.SH SEE ALSO
.BR chfn (1),
.BR chsh (1),
.BR passwd (1),
.BR crypt (3),
.BR groupadd (8),
.BR groupdel (8),
.BR groupmod (8),
.BR useradd (8),
.BR userdel (8)
.SH AUTHOR
Julianne Frances Haugh (jockgrrl@ix.netcom.com)