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Under GNU General Public License
2012-05-26 04:38 @38.107.179.238 Crawled by CCBot/1.0 (+http://www.commoncrawl.org/bot.html)
USERMOD(8) System Management Commands USERMOD(8)
NAME
usermod - modify a user account
SYNOPSIS
usermod [options] LOGIN
DESCRIPTION
The usermod command modifies the system account files to reflect the changes that are
specified on the command line.
OPTIONS
The options which apply to the usermod command are:
-a, --append
Add the user to the supplemental group(s). Use only with -G option.
-c, --comment COMMENT
The new value of the user's password file comment field. It is normally modified using
the chfn(1) utility.
-d, --home HOME_DIR
The user's new login directory. If the -m 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.
-e, --expiredate EXPIRE_DATE
The date on which the user account will be disabled. The date is specified in the
format YYYY-MM-DD.
-f, --inactive INACTIVE
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.
-g, --gid GROUP
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.
-G, --groups GROUP1[,GROUP2,...[,GROUPN]]]
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 -g option. If the user is
currently a member of a group which is not listed, the user will be removed from the
group. This behaviour can be changed via the -a option, which appends the user to the
current supplementary group list.
-l, --login NEW_LOGIN
The name of the user will be changed from LOGIN to NEW_LOGIN. Nothing else is changed.
In particular, the user's home directory name should probably be changed manually to
reflect the new login name.
-L, --lock
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 -p or -U.
Note: if you wish to lock the account (not only access with a password), you should
also set the EXPIRE_DATE to 1.
-o, --non-unique
When used with the -u option, this option allows to change the user ID to a non-unique
value.
-p, --password PASSWORD
The encrypted password, as returned by crypt(3).
-s, --shell SHELL
The name of the user's new login shell. Setting this field to blank causes the system
to select the default login shell.
-u, --uid UID
The numerical value of the user's ID. This value must be unique, unless the -o option
is used. The value must be non-negative. Values between 0 and 999 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.
-U, --unlock
Unlock a user's password. This removes the '!' in front of the encrypted password. You
can't use this option with -p or -L.
Note: if you wish to unlock the account (not only access with a password), you should
also set the EXPIRE_DATE (for example to 99999, or to the EXPIRE value from
/etc/default/useradd).
CAVEATS
usermod 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.
CONFIGURATION
The following configuration variables in /etc/login.defs change the behavior of this tool:
MAIL_DIR (string)
The mail spool directory. This is needed to manipulate the mailbox when its
corresponding user account is modified or deleted. If not specified, a compile-time
default is used.
MAIL_FILE (string)
Defines the location of the users mail spool files relatively to their home directory.
The MAIL_DIR and MAIL_FILE variables are used by useradd, usermod, and userdel to create,
move, or delete the user's mail spool.
MAX_MEMBERS_PER_GROUP (number)
Maximum members per group entry. When the maximum is reached, a new group entry (line)
is started in /etc/group (with the same name, same password, and same GID).
The default value is 0, meaning that there are no limits in the number of members in a
group.
This feature (split group) permits to limit the length of lines in the group file.
This is useful to make sure that lines for NIS groups are not larger than 1024
characters.
If you need to enforce such limit, you can use 25.
Note: split groups may not be supported by all tools (even in the Shadow toolsuite.
You should not use this variable unless you really need it.
FILES
/etc/group
Group account information.
/etc/passwd
User account information.
/etc/shadow
Secure user account information.
SEE ALSO
chfn(1), chsh(1), passwd(1), crypt(3), gpasswd(8), groupadd(8), groupdel(8), groupmod(8),
login.defs(5), useradd(8), userdel(8).
System Management Commands 12/06/2009 USERMOD(8)
Generated by $Id: phpMan.php,v 4.49 2006/02/26 13:18:18 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
2012-05-26 04:38 @38.107.179.238 Crawled by CCBot/1.0 (+http://www.commoncrawl.org/bot.html)