1，linux下文件权限管理，添加用户组并添加用户
添加组：groupadd 组名
groupadd deploy
cat /etc/group | grep deploy
如图：
删除组：groupdel 组名
groupdel deploy
cat /etc/group | grep deploy
查询组：cat /etc/group 或者使用管道来精确查询 cat /etc/group | grep dev
如图：
/etc 目录是专门用来保存 系统配置信息 的目录
group 是保存组信息的文件
2，添加用户
添加用户：useradd -m -g 组 新建用户名 注意：-m 自动建立用户家目录； -g 指定用户所在的组，否则会建立一个和用户名同名的组
useradd -m -g deploy test
deploy 为用户组，test1为用户名
查询用户：在/etc/passwd文件下存储的是用户的list
cat /etc/passwd
如图：
只查找deploy用户
id deploy
如图：
修改和创建密码 passwd 用户名 如果不加用户名则默认修改当前登录者的密码
[root@Server-n93yom ~]# passwd test1
Changing password for user test1.
New password:
BAD PASSWORD: The password is shorter than 8 characters
Retype new password:
passwd: all authentication tokens updated successfully.
[root@Server-n93yom ~]#
设置好密码后，使用此账号和密码登录
➜ ~ ssh test1@192.168.85.163
test1@192.168.85.163’s password:
Last failed login: Mon Jul 22 17:00:05 CST 2019 from 192.168.1.53 on ssh:notty
There were 3 failed login attempts since the last successful login.
[test1@Server-n93yom ~]$
设置用户不能修改密码
[root@Server-n93yom ~]# passwd -l test1 //在root下，禁止test1用户修改密码的权限
Locking password for user test1. //锁住test1不能修改密码
passwd: Success
[root@Server-n93yom ~]# su test1 //切换用户
[test1@Server-n93yom root]$ passwd //修改密码
Changing password for user test1.
Changing password for test1.
(current) UNIX password:
passwd: Authentication token manipulation error //没用权限修改密码
[test1@Server-n93yom root]$
清除密码
[root@Server-n93yom ~]# passwd -d test1 //删除test1的密码
Removing password for user test1.
passwd: Success
[root@Server-n93yom ~]# passwd -S test1 //查看test1的密码
test1 NP 2019-07-22 0 99999 7 -1 (Empty password.) //密码为空
[root@Server-n93yom ~]#
passwd 帮助命令
[root@Server-n93yom ~]# passwd –help
Usage: passwd [OPTION…]
-k, –keep-tokens keep non-expired authentication tokens
-d, –delete delete the password for the named account (root only)
-l, –lock lock the password for the named account (root only)
-u, –unlock unlock the password for the named account (root only)
-e, –expire expire the password for the named account (root only)
-f, –force force operation
-x, –maximum=DAYS maximum password lifetime (root only)
-n, –minimum=DAYS minimum password lifetime (root only)
-w, –warning=DAYS number of days warning users receives before password
expiration (root only)
-i, –inactive=DAYS number of days after password expiration when an account
becomes disabled (root only)
-S, –status report password status on the named account (root only)
–stdin read new tokens from stdin (root only)
Help options:
-?, –help Show this help message
–usage Display brief usage message
[root@Server-n93yom ~]#
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