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$ groupadd dev
groupadd permission denied
#创建组 组名dev
$sudo groupadd dev
#查看
$cat /etc/group
#删除组
$sudo groupdel dev
#确认组被删除
$cat /etc/group
$ groupadd dev
groupadd permission denied
#创建组 组名dev
$sudo groupadd dev
#查看
$cat /etc/group
#删除组
$sudo groupdel dev
#确认组被删除
$cat /etc/group