Linux User and Rights management

1. User's additions and deletions change

Useradd Xiaoguo Create a user

Passed Xiaoguo Modify or add a password

Userdel Xiaoguo Delete a user

NL Shadow

NL passwd

RM-RF testuser Delete the directory where the user testuser is located

Usermod-l Xiaoguo Lock User

Usermod-u Xiaoguo Unlock user//nl/etc/shadow Remove the password in front of!

USERMOD-G root Xiaoguo Modify user groups

Groupmod-n xiaoguogroup Xiaoguo Modify Group name

ID Xiaoguo Viewing the user's basic information

Chage-l Xiaoguo Viewing the user's basic information

Chage-d 2013-02-18 Student Modify the time the user last modified

Problems you may encounter:

# #在容器里面修改用户密码的时候报错:

/usr/share/cracklib/pw_dict.pwd:no such file or directory

Pwopen:no such file or directory

Solve:

yum-y Reinstall Cracklib-dicts

2. Permissions of the user

Drwxrwxrwx

First letter: representing the file type

2nd to 4th character: represents the current user's permissions

5th to 7th character: represents the current user group permissions

8th to 10th character: Represents the permissions of other users

chmod command

A: All rights/All users

U: User

G: User Group

O: Other users

+: Plus permissions

-: Subtract Permissions

=: equals permission

Eg: add executable permissions to file file.txt

chmod a+x file.txt

0: No Permissions

1:x

2:w

3:xw

4:r

5:rx

6:rw

7:rwx

This article is from the "Zhang Xiao" blog, make sure to keep this source http://benchmarking.blog.51cto.com/12343634/1878055

Linux User and Rights management