deluser(8)

NAME#

deluser, delgroup - remove a user or group from the system

SYNOPSIS#

DESCRIPTION#

deluser and delgroup remove users and groups from the system according to command line options and configuration information in /etc/deluser.conf and /etc/adduser.conf.

They are more Debian specific front ends to the userdel and groupdel programs, which are more distribution agnostic. deluser and delgroup can remove the home directory as option or even all files on the system owned by the user to be removed, run a custom script, and have other features.

For a full list and explanations of all options, see the OPTIONS section.

deluser and delgroup can be run in one of three modes:

Remove a user#

If called with one non-option argument and without the --group option, deluser will remove a non-system user.

By default, deluser will remove the user without removing the home directory, the mail spool or any other files on the system owned by the user. Removing the home directory and mail spool can be achieved using the --remove-home option.

The --remove-all-files option removes all files on the system owned by the user. Note that if you activate both options --remove-home will have no additional effect because all files including the home directory and mail spool are already covered by the --remove-all-files option.

If you want to backup all files before deleting them you can activate the --backup option which will create a file username.tar(.gz|.bz2) in the directory specified by the --backup-to option.

By default, the backup archive is compressed with gzip(1). To change this, the --backup-suffix option can be set to any suffix supported by tar --auto-compress.

deluser will refuse to remove the root account.

If the --system option is given on the command line, the delete operation is actually executed only if the user is a system user. This avoids accidentally deleting non-system users. Additionally, if the user does not exist, no error value is returned. Debian package maintainer scripts may use this flag to remove system users or groups while ignoring the case where the removal already occurred.

Remove a group#

If deluser is called with the --group option, or delgroup is called, a group will be removed. The primary group of an existing user cannot be removed. If the option --only-if-empty is given, the group won't be removed if it has any members left.

The --system option adds the same functionality as for users, respectively.

Remove a user from a specific group#

If called with two non-option arguments, deluser will remove a user from a specific group.

OPTIONS#

Different modes of deluser allow different options. If no valid modes are listed for a option, it is accepted in all modes.

Short versions for certain options may exist for historical reasons. They are going to stay supported, but are removed from the documentation. Users are advised to migrate to the long version of options.

--backup

Backup all files contained in the userhome and the mailspool file to a file named username.tar.bz2 or username.tar.gz. Valid modes: deluser, deluser --system.

--backup-suffixstr

Select compression algorithm for a home directory backup. Can be set to any suffix recognized by tar --auto-compress. Defaults to .gz. Valid modes: deluser, deluser --system.

--backup-todir

Place the backup files not in the current directory but in dir. This implicitly sets --backup also. Defaults to the current working directory. Valid modes: deluser, deluser --system.

--conf file

Use file instead of the default files /etc/deluser.conf and /etc/adduser.conf. Multiple --conf options may be given.

--debug

Synonymous to --stdoutmsglevel=debug. Deprecated.

--group

Remove a group. This is the default action if the program is invoked as delgroup. Valid mode: deluser.

--help

Display brief instructions.

--only-if-empty

Only remove if no members are left. Valid modes: deluser --group, delgroup.

--quiet

Synonymous to --stdoutmsglevel=warn. Deprecated.

--remove-all-files

Remove all files from the system owned by this user. Note: --remove-home does not have an effect any more. If --backup is specified, the files are deleted after having performed the backup. Valid modes: deluser, deluser --system.

--remove-home

Remove the home directory of the user and its mailspool. If --backup is specified, the files are deleted after having performed the backup. Valid modes: deluser, deluser --system.

--system

Only delete if user/group is a system user/group. If the user does not exist, no error value is returned. Valid modes: deluser, deluser --system.

--verbose

Synonymous to --stdoutmsglevel=info. Deprecated.

--stdoutmsglevelprio

--stderrmsglevelprio

--logmsglevelprio

Minimum priority for messages logged to syslog/journal and the console, respectively. Values are trace, debug, info, warn, err, and fatal. Messages with the priority set here or higher get printed to the respective medium. Messages printed to stderr are not repeated on stdout. That allows the local admin to control adduser's chattiness on the console and in the log independently, keeping probably confusing information to itself while still leaving helpful information in the log.

--version

Display version and copyright information.

LOGGING↲#

deluser uses extensive and configurable logging to tailor its verbosity to the needs and wishes of the system administrator.

This works similar to adduser. See adduser(8) for all the details.

EXIT VALUES#

The exit values documented in adduser(8) also apply for deluser.

SECURITY#

deluser needs root privileges and offers, via the --conf command line option to use different configuration files. Do not use sudo(8) or similar tools to give partial privileges to deluser with restricted command line parameters. This is easy to circumvent and might allow users to obtain privileges they are not supposed to have. If you want this, consider writing your own wrapper script and giving privileges to execute that script.

FILES#

/etc/deluser.conf Default configuration file for deluser(8) and delgroup(8)

/usr/local/sbin/deluser.local

Optional custom add-ons, see deluser.local(8)

SEE ALSO#

adduser(8), deluser.conf(5), deluser.local.conf(8), groupdel(8), userdel(8)