linux中创建用户、设置密码、彻底删除用户

 

 

1、查看系统中当前的所有用户

[root@centos7pc1 test2]# grep bash /etc/passwd
root:x:0:0:root:/root:/bin/bash
liujiaxin01:x:1000:1000:liujiaxin01:/home/liujiaxin01:/bin/bash

 

2、使用useradd命令创建用户

[root@centos7pc1 test2]# grep bash /etc/passwd
root:x:0:0:root:/root:/bin/bash
liujiaxin01:x:1000:1000:liujiaxin01:/home/liujiaxin01:/bin/bash
[root@centos7pc1 test2]# useradd liujiaxin02     ## 创建用户
[root@centos7pc1 test2]# grep bash /etc/passwd   ## 查看创建结果
root:x:0:0:root:/root:/bin/bash
liujiaxin01:x:1000:1000:liujiaxin01:/home/liujiaxin01:/bin/bash
liujiaxin02:x:1001:1001::/home/liujiaxin02:/bin/bash

 

3、为新创建用户设置密码

新用户并没有密码：

[root@centos7pc1 test2]# tail /etc/shadow
nfsnobody:!!:19082::::::
gnome-initial-setup:!!:19082::::::
pcp:!!:19082::::::
sshd:!!:19082::::::
avahi:!!:19082::::::
postfix:!!:19082::::::
oprofile:!!:19082::::::
tcpdump:!!:19082::::::
liujiaxin01:$6$tjWzJEGq3eeY3CdZ$hJW0oB4X.hmJFW42SOCGxRXA8SdNRXLRwdnBPI/tPyphyT1CYXFbxEh7u.GPmNp2s3IHMSaut4DSXjutMqL/31::0:99999:7:::
liujiaxin02:!!:19083:0:99999:7:::        ## 新用户并没有密码

 

使用passwd命令为新用户创建密码：

[root@centos7pc1 test2]# passwd liujiaxin02         ## 为新用户创建密码， 需要两次确认
Changing password for user liujiaxin02.
New password:
Retype new password:
passwd: all authentication tokens updated successfully.

 

查看创建密码结果： 

[root@centos7pc1 test2]# tail /etc/shadow
nfsnobody:!!:19082::::::
gnome-initial-setup:!!:19082::::::
pcp:!!:19082::::::
sshd:!!:19082::::::
avahi:!!:19082::::::
postfix:!!:19082::::::
oprofile:!!:19082::::::
tcpdump:!!:19082::::::
liujiaxin01:$6$tjWzJEGq3eeY3CdZ$hJW0oB4X.hmJFW42SOCGxRXA8SdNRXLRwdnBPI/tPyphyT1CYXFbxEh7u.GPmNp2s3IHMSaut4DSXjutMqL/31::0:99999:7:::
liujiaxin02:$6$uU6mKOlv$Lyy0XjagGHyTHLClqKoIx4b/RYooUkfbujr6A/nSwQrOHCCSCyQmYiXlTsuReGNhWAgpCk9P/7cO.OD2ZFnXY/:19083:0:99999:7:::

 

4、彻底删除用户

查看用户及密码：

[root@centos7pc1 test2]# tail /etc/passwd
nfsnobody:x:65534:65534:Anonymous NFS User:/var/lib/nfs:/sbin/nologin
gnome-initial-setup:x:988:982::/run/gnome-initial-setup/:/sbin/nologin
pcp:x:987:981:Performance Co-Pilot:/var/lib/pcp:/sbin/nologin
sshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/sbin/nologin
avahi:x:70:70:Avahi mDNS/DNS-SD Stack:/var/run/avahi-daemon:/sbin/nologin
postfix:x:89:89::/var/spool/postfix:/sbin/nologin
oprofile:x:16:16:Special user account to be used by OProfile:/var/lib/oprofile:/sbin/nologin
tcpdump:x:72:72::/:/sbin/nologin
liujiaxin01:x:1000:1000:liujiaxin01:/home/liujiaxin01:/bin/bash
liujiaxin02:x:1001:1001::/home/liujiaxin02:/bin/bash
[root@centos7pc1 test2]# tail /etc/shadow
nfsnobody:!!:19082::::::
gnome-initial-setup:!!:19082::::::
pcp:!!:19082::::::
sshd:!!:19082::::::
avahi:!!:19082::::::
postfix:!!:19082::::::
oprofile:!!:19082::::::
tcpdump:!!:19082::::::
liujiaxin01:$6$tjWzJEGq3eeY3CdZ$hJW0oB4X.hmJFW42SOCGxRXA8SdNRXLRwdnBPI/tPyphyT1CYXFbxEh7u.GPmNp2s3IHMSaut4DSXjutMqL/31::0:99999:7:::
liujiaxin02:$6$uU6mKOlv$Lyy0XjagGHyTHLClqKoIx4b/RYooUkfbujr6A/nSwQrOHCCSCyQmYiXlTsuReGNhWAgpCk9P/7cO.OD2ZFnXY/:19083:0:99999:7:::
[root@centos7pc1 test2]# ls /home/
liujiaxin01  liujiaxin02  software  test  test2

 

使用userdel -r命令彻底删除用户：

[root@centos7pc1 test2]# userdel -r liujiaxin02         ## 彻底删除用户

 

查看删除效果：

[root@centos7pc1 test2]# tail /etc/passwd
rpcuser:x:29:29:RPC Service User:/var/lib/nfs:/sbin/nologin
nfsnobody:x:65534:65534:Anonymous NFS User:/var/lib/nfs:/sbin/nologin
gnome-initial-setup:x:988:982::/run/gnome-initial-setup/:/sbin/nologin
pcp:x:987:981:Performance Co-Pilot:/var/lib/pcp:/sbin/nologin
sshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/sbin/nologin
avahi:x:70:70:Avahi mDNS/DNS-SD Stack:/var/run/avahi-daemon:/sbin/nologin
postfix:x:89:89::/var/spool/postfix:/sbin/nologin
oprofile:x:16:16:Special user account to be used by OProfile:/var/lib/oprofile:/sbin/nologin
tcpdump:x:72:72::/:/sbin/nologin
liujiaxin01:x:1000:1000:liujiaxin01:/home/liujiaxin01:/bin/bash
[root@centos7pc1 test2]# tail /etc/shadow
rpcuser:!!:19082::::::
nfsnobody:!!:19082::::::
gnome-initial-setup:!!:19082::::::
pcp:!!:19082::::::
sshd:!!:19082::::::
avahi:!!:19082::::::
postfix:!!:19082::::::
oprofile:!!:19082::::::
tcpdump:!!:19082::::::
liujiaxin01:$6$tjWzJEGq3eeY3CdZ$hJW0oB4X.hmJFW42SOCGxRXA8SdNRXLRwdnBPI/tPyphyT1CYXFbxEh7u.GPmNp2s3IHMSaut4DSXjutMqL/31::0:99999:7:::
[root@centos7pc1 test2]# ls /home/
liujiaxin01  software  test  test2