Instructions for using User management commands in Linux

1.groupadd

This command is used to create a new user group.

2. Groupmod

This command is used to modify the properties of a group.

3. Groups

This command displays the group that the current user is in.

4.passwd

The passwd (password) command allows the user to modify the password for the account. In general, there are several scenarios in which an account password failure can be set: the password is too simple, the password is too short, and the characters in the password are the same. For example:

[Root@teacher root]$ passwd

Changing password for user zjz.

Changing Password for ZJZ

(current) UNIX Password:

New Password:

Bad Password:it ' s WAY too Short

New Password:

Bad Password:is too simple

New Password:

Bad password:it does not contain enough different characters

Retype new Password:

Passwd:all authentication tokens updated successfully.

5.su

This command is very important to enable a general user to have Superuser or other user privileges, or to enable Superuser to do something as a general user. But the general http://www.aliyun.com/zixun/aggregation/6579.html "> user must have a superuser or other user's password when using this command. If you want to exit the current user's login, you can enter exit.

6.useradd

This command is the quickest and easiest way to create a user account.

7. Userdel

This command is used to delete user accounts and their associated files.

8. Who

This command lets you see which users are logged on to the current computer, for example:

[Root@teacher root]$ who

root:0 Jun23 08:22

Root pts/0 Jun23 08:53 (: 0.0)-show who, logged on

9.whoami

This command is used to view the current user's login name. For example:

[Root@teacher root]$ WhoAmI

Root