Man page 8 : userdel

userdel - delete a user account and related files

userdel [options] LOGIN

userdel is a low level utility for removing users. On Debian, administrators should usually use deluser(8) instead.

The userdel command modifies the system account files, deleting all entries that refer to the user name LOGIN. The named user must exist.

The options which apply to the userdel command are:

-f, --force
    This option forces the removal of the user account, even if the user is still logged in. It also forces userdel to remove the userAqs home directory and mail spool, even if another user uses the same home directory or if the mail spool is not owned by the specified user. If USERGROUPS_ENAB is defined to yes in /etc/login.defs and if a group exists with the same name as the deleted user, then this group will be removed, even if it is still the primary group of another user.

Note: This option is dangerous and may leave your system in an inconsistent state.

-h, --help
    Display help message and exit.

-r, --remove
    Files in the userAqs home directory will be removed along with the home directory itself and the userAqs mail spool. Files located in other file systems will have to be searched for and deleted manually.

The mail spool is defined by the MAIL_DIR variable in the login.defs file.

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 userAqs 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.

USERDEL_CMD (string)
    If defined, this command is run when removing a user. It should remove any at/cron/print jobs etc. owned by the user to be removed (passed as the first argument).

The return code of the script is not taken into account.

Here is an example script, which removes the userAqs cron, at and print jobs:


    .

#! /bin/sh
# Check for the required argument.
if [ $# != 1 ]; then
	echo "Usage: $0 username"
	exit 1
fi
# Remove cron jobs.
crontab -r -u $1
# Remove at jobs.
# Note that it will remove any jobs owned by the same UID,
# even if it was shared by a different username.
AT_SPOOL_DIR=/var/spool/cron/atjobs
find $AT_SPOOL_DIR -name "[^.]*" -type f -user $1 -delete \;
# Remove print jobs.
lprm $1
# All done.
exit 0

.

USERGROUPS_ENAB (boolean)
    If set to yes, userdel will remove the userAqs group if it contains no more members, and useradd will create by default a group with the name of the user.

/etc/group
    Group account information.

/etc/login.defs
    Shadow password suite configuration.

/etc/passwd
    User account information.

/etc/shadow
    Secure user account information.

The userdel command exits with the following values:

0
    success

1
    canAqt update password file

2
    invalid command syntax

6
    specified user doesnAqt exist

8
    user currently logged in

10
    canAqt update group file

12
    canAqt remove home directory

userdel will not allow you to remove an account if there are running processes which belong to this account. In that case, you may have to kill those processes or lock the userAqs password or account and remove the account later. The -f option can force the deletion of this account.

You should manually check all file systems to ensure that no files remain owned by this user.

You may not remove any NIS attributes on a NIS client. This must be performed on the NIS server.

If USERGROUPS_ENAB is defined to yes in /etc/login.defs, userdel will delete the group with the same name as the user. To avoid inconsistencies in the passwd and group databases, userdel will check that this group is not used as a primary group for another user, and will just warn without deleting the group otherwise. The -f option can force the deletion of this group.

chfn(1), chsh(1), passwd(1), login.defs(5), gpasswd(8), groupadd(8), groupdel(8), groupmod(8), useradd(8), usermod(8).