Linux管理用户和组

[root@server0 ~]# useradd nsd01
[root@server0 ~]# id nsd01             #查看用户基本信息
uid=1001(nsd01) gid=1001(nsd01) 组=1001(nsd01)
[root@server0 ~]# grep ‘nsd01‘ /etc/passwd
[root@server0 ~]# useradd -u 1200 nsd02
[root@server0 ~]# grep ‘nsd02‘ /etc/passwd
[root@server0 ~]# id nsd02
[root@server0 ~]# useradd -d /opt/abc nsd07 #指定家目录
[root@server0 ~]# grep ‘nsd07‘ /etc/passwd
 
[root@server0 ~]# useradd -s /sbin/nologin nsd09   #/sbin/nologin：阻止用户登陆系统
[root@server0 ~]# grep ‘nsd09‘ /etc/passwd
[root@server0 ~]# groupadd study
[root@server0 ~]# useradd -g study  nsd10   #指定基本组
[root@server0 ~]# id nsd10
[root@server0 ~]# useradd -G study nsd11   #指定附加组
[root@server0 ~]# id nsd11

[root@server0 ~]# head -12 /etc/passwd | tail -5
[root@server0 ~]# cat -n /etc/passwd | head -12 | tail -5
[root@server0 ~]# ifconfig | head -2
[root@server0 ~]# ifconfig | less
[root@server0 ~]# echo 1+1 | bc
[root@server0 ~]# echo 3*2 | bc

[root@server0 ~]# passwd  nsd01

[root@server0 ~]# echo 123 | passwd --stdin nsd01
[root@server0 ~]# echo redhat | passwd --stdin nsd02

[root@server0 ~]# useradd nsd12
[root@server0 ~]# grep ‘nsd12‘ /etc/passwd
[root@server0 ~]# usermod -u 1600 -d /opt/test  -G study -s /sbin/nologin nsd12
#改变用户的ID，家目录，附加组以及是否能登录
[root@server0 ~]# grep ‘nsd12‘ /etc/passwd
[root@server0 ~]# id nsd12

[root@server0 ~]# userdel   nsd01
[root@server0 ~]# id  nsd01
[root@server0 ~]# userdel  -r  nsd02  #递归删除
[root@server0 ~]# id  nsd02

[root@server0 ~]# grep ‘stugrp‘ /etc/group
stugrp:x:1605:

[root@server0 ~]# grep ‘stugrp‘ /etc/group
[root@server0 ~]# gpasswd -a natasha stugrp
[root@server0 ~]# grep ‘stugrp‘ /etc/group
[root@server0 ~]# gpasswd -a kenji stugrp
[root@server0 ~]# grep ‘stugrp‘ /etc/group
[root@server0 ~]# gpasswd -d kenji stugrp
[root@server0 ~]# grep ‘stugrp‘ /etc/group