Provided by: passwd_18.104.22.168+svn3283-3ubuntu5_i386
The following configuration variables in /etc/login.defs change the
behavior of this tool:
. . , .
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.
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.
, . at/cron/ ( ).
The return code of the script is not taken into account.
Here is an example script, which removes the user's cron, at and
# Check for the required argument.
if [ $# != 1 ]; then
echo "Usage: $0 username"
# 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.
find $AT_SPOOL_DIR -name "[^.]*" -type f -user $1 -delete \;
# Remove print jobs.
# All done.
If set to yes, userdel will remove the user's group if it contains
no more members, and useradd will create by default a group with
the name of the user.
userdel , :
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 user's password or account and remove
the account later. The -f option can force the deletion of this
You should manually check all file systems to ensure that no files
remain owned by this user.
NIS NIS. NIS .
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).