Linux系统三类用户身份---uid

[root@localhost Desktop]# useradd -u 8888 lence.zhou
[root@localhost Desktop]# id lence.zhou
uid=8888(lence.zhou) gid=8888(lence.zhou) groups=8888(lence.zhou)

 
修改用户的uid
usermod -u 666666 xiaozhang

[root@localhost Desktop]# id xiaozhang
uid=666666(xiaozhang) gid=1005(xiaozhang) groups=1005(xiaozhang)
[root@localhost Desktop]# usermod -u 666666 xiaozhang
usermod: no changes
[root@localhost Desktop]# id xiaozhang
uid=666666(xiaozhang) gid=1005(xiaozhang) groups=1005(xiaozhang)

 
添加扩展组
usermod -G itgroup xiaozhang

[root@localhost Desktop]# id xiaozhang
uid=666666(xiaozhang) gid=1005(xiaozhang) groups=1005(xiaozhang)
[root@localhost Desktop]# usermod -G itgroup xiaozhang
[root@localhost Desktop]# id xiaozhang
uid=666666(xiaozhang) gid=1005(xiaozhang) groups=1005(xiaozhang),8889(itgroup)

 
修改基本组
usermod -g 基本组 xiaozhang

 
用户组
创建用户组 groupadd

 
删除用户组里的用户，dd命令
vim /etc/group

 
删除用户
userdel xiaozhang
cd home目录，把xiaozhang的目录删掉

userdel -r zhangsan，彻底将用户及其家目录删掉

[root@localhost Desktop]# userdel xiaozhang
[root@localhost Desktop]# cd /home/
[root@localhost home]# ls
admins     jack        natasha      sudan.lu      xiaotong
bugle.pan  lence.zhou  ronny        wangwu        xiaozhang
cici.liu   linuxprobe  sampson.qiu  wwwroot       zhangsan
harry      lisi        sarah        xiangxi.kong
[root@localhost home]# userdel -r zhagnsan
userdel: user ‘zhagnsan‘ does not exist
[root@localhost home]# userdel -r zhangsan
[root@localhost home]# ls
admins     harry       linuxprobe  ronny        sudan.lu  xiangxi.kong
bugle.pan  jack        lisi        sampson.qiu  wangwu    xiaotong
cici.liu   lence.zhou  natasha     sarah        wwwroot   xiaozhang

Linux系统三类用户身份---uid

原文：https://blog.51cto.com/sampsondotqiu/2490993