chapter03

[root@localhost ~]# groupadd group1

[root@localhost ~]# mkdir -p /testgroup1

[root@localhost ~]# groupadd jiaoxue

[root@localhost ~]# useradd -d /testgroup1/tom/ -g group1 -G jiaoxue -s /bin/bash -e 2016-01-01 tom

[root@localhost ~]# passwd tom

更改用户 tom 的密码 。

新的 密码：

无效的密码： 密码少于 8 个字符

重新输入新的 密码：

passwd：所有的身份验证令牌已经成功更新。

[root@localhost ~]# tail -1 /etc/passwd

tom:x:1001:1001::/testgroup1/tom/:/bin/bash 

[root@localhost ~]# tail -1 /etc/shadow

tom:$6$/46q2wnB$LDJjpwzVLcgkwymoIJFGZhkYoFLI4CWP6Elzw1KIkmmCWxiiVaXJC1HC9mEdwu5cHkK002jexd2mhaakaXhVq.:18106:0:99999:7::16801:

[root@localhost ~]# vi ~tom/.bash_profile

[root@localhost ~]# vi ~tom/.bashrc

[root@localhost ~]# vi ~tom/.bash_logout

[root@localhost ~]# passwd -l tom

锁定用户 tom 的密码 。

passwd: 操作成功

[root@localhost ~]# passwd -S tom

tom LK 2019-07-29 0 99999 7 -1 (密码已被锁定。)

[root@localhost ~]# passwd -u tom

解锁用户 tom 的密码。

passwd: 操作成功

[root@localhost ~]# passwd -S tom

tom PS 2019-07-29 0 99999 7 -1 (密码已设置，使用 SHA512 算法。)

[root@localhost ~]# passwd -d tom

清除用户的密码 tom。

passwd: 操作成功

[root@localhost ~]# usermod -l tom1 tom

[root@localhost ~]# tail -1 /etc/passwd

tom1:x:1001:1001::/testgroup1/tom/:/bin/bash

[root@localhost ~]# usermod -c jiaoxue tom1

[root@localhost ~]# tail -1 /etc/passwd

tom1:x:1001:1001:jiaoxue:/testgroup1/tom/:/bin/bash

[root@localhost ~]# userdel -r tom1

[root@localhost ~]# ls /testgroup1

[root@localhost ~]# tail -3 /etc/group

chrnyu:x:1000:chrnyu

group1:x:1001:

jiaoxue:x:1002:

[root@localhost ~]# groupadd  -g 888 market

[root@localhost ~]# tail -4 /etc/group

chrnyu:x:1000:chrnyu

group1:x:1001:

jiaoxue:x:1002:

market:x:888:

[root@localhost ~]# useradd test1

[root@localhost ~]# useradd test2

[root@localhost ~]# useradd test3

[root@localhost ~]# gpasswd -a test1 market

正在将用户“test1”加入到“market”组中

[root@localhost ~]# tail -4 /etc/group

market:x:888:test1

test1:x:1003:

test2:x:1004:

test3:x:1005:

[root@localhost ~]# gpasswd -d test1 market

正在将用户“test1”从“market”组中删除

[root@localhost ~]# tail -4 /etc/group

market:x:888:

test1:x:1003:

test2:x:1004:

test3:x:1005:

[root@localhost ~]# gpasswd -M test1,test2,test3 market

[root@localhost ~]# tail -4 /etc/group

market:x:888:test1,test2,test3

test1:x:1003:

test2:x:1004:

test3:x:1005:

[root@localhost ~]# gpasswd -M test1 market

[root@localhost ~]# tail -4 /etc/group

market:x:888:test1

test1:x:1003:

test2:x:1004:

test3:x:1005:

[root@localhost ~]# groupdel market

[root@localhost ~]# tail -5 /etc/group

group1:x:1001:

jiaoxue:x:1002:

test1:x:1003:

test2:x:1004:

test3:x:1005:

[root@localhost ~]# id amber

id: amber: no such user

[root@localhost ~]# id

uid=0(root) gid=0(root) 组=0(root) 环境=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023

[root@localhost ~]# groups amber

groups: amber: no such user

[root@localhost ~]# groups

Root

[root@localhost yum.repos.d]# finger

Login     Name       Tty      Idle  Login Time   Office     Office Phone   Host

root      root      *:0             Jul 29 18:34                           (:0)

root      root       pts/0      45  Jul 29 18:35                           (:0)

root      root       pts/1          Jul 29 18:35                           (192.168.100.150)

[root@localhost ~]# w

 19:21:40 up 47 min,  3 users,  load average: 0.03, 0.04, 0.05

USER     TTY      FROM             LOGIN@   IDLE   JCPU   PCPU WHAT

root     :0       :0               18:34   ?xdm?  21.75s  0.15s /usr/libexec/gnome-session-binary --session gnome

root     pts/0    :0               18:35   46:28   0.03s  0.03s bash

root     pts/1    192.168.100.150  18:35    4.00s  0.34s  0.03s w

[root@localhost ~]# whoami

root

[root@localhost ~]# who

root     :0           2019-07-29 18:34 (:0)

root     pts/0        2019-07-29 18:35 (:0)

root     pts/1        2019-07-29 18:35 (192.168.100.150)