在Linux中使用delgroup命令删除组使用delgroup删除用户组ftpusers：
sudo delgroup {group}
sudo delgroup --group {group}
sudo delgroup ftpusers
grep '^ftpusers' /etc/group
只删除系统组ftpusers：
sudo delgroup --system --group ftpusers
在删除任何组之前备份文件：
sudo delgroup --backup --group ftpusers
如何从用户组中删除用户从ftpusers组中删除用户tom
sudo deluser {user} {group}
sudo deluser tom ftpusers
配置文件文件/etc/deluser.conf包含了deluser命令和delgroup命令的默认值。
cat /etc/deluser.conf
# /etc/deluser.conf: `deluser' configuration.
# Remove home directory and mail spool when user is removed
REMOVE_HOME = 0
# Remove all files on the system owned by the user to be removed
REMOVE_ALL_FILES = 0
# Backup files before removing them. This options has only an effect if
# REMOVE_HOME or REMOVE_ALL_FILES is set.
BACKUP = 0
# target directory for the backup file
BACKUP_TO = "."
# delete a group even there are still users in this group
ONLY_IF_EMPTY = 0
# exclude these filesystem types when searching for files of a user to backup
EXCLUDE_FSTYPES = "(proc|sysfs|usbfs|devpts|tmpfs|afs)"