linux permission management

User Management

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 useradd create user

Options:

-u UID

-g GID

-d Home directory, ordinary users have the highest authority in the home directory; the default is in the /home directory of the operating system.

-s User-enabled shell, GUI and command line after login.

[root@localhost zyj]# useradd sl   // Create home directory and group ID by default, username id and shell after login 
[root@localhost zyj]# cd / home
[root@localhost home]# ls
hello.txt  sl  x  zyj
[root@localhost sl]# more /etc/passwd
root:x:0:0:root:/root:/bin/bash
bin:x:1:1:bin:/bin:/sbin/nologin
daemon:x:2:2:daemon:/sbin:/sbin/nologin
adm:x:3:4:adm:/var/adm:/sbin/nologin
sl:x:501:501::/home/sl:/bin/bash  

userdel: delete user

[root@localhost sl]# userdel sl
[root@localhost sl]# more /etc/passwd
root:x:0:0:root:/root:/bin/bash
bin:x:1:1:bin:/bin:/sbin/nologin
daemon:x:2:2:daemon:/sbin:/sbin/nologin
adm:x:3:4:adm:/var/adm:/sbin/nologin
zyj:x:500:500: python_full:/home/zyj:/bin/bash

 

usermod

passwd

chsh

chfn

finger

id

chage

 

group management

groupadd

groupdel

groupmod

gpasswd

 

 

authority management

chown

chgrp

chmod

umask