Creation of users and groups under Linux

1. Add Users

[Email protected] testdir]# Useradd–help

Usage:useradd [Options] LOGIN

Options:

-b,–base-dir Base_dir Set the base path as the user's logon directory

-c,–comment comment comments to the user

-d,–home-dir Home_dir Setting the user's login directory

-d,–defaults changing settings

-e,–expiredate Expire_date Set the user's validity period

-f,–inactive inactive user expires, make password invalid

-g,–gid Group enables users to belong to only one group

-g,–groups groups enables users to join a group, add multiple groups, and separate them with commas.

-h,–help Help

-k,–skel Skel_dir Specify a different Skel directory

-k,–key key=value Overwrite/etc/login.defs configuration file

-m,–create-home Automatically create login directories

-L, do not add the user to the Lastlog file

-M, do not create the login directory automatically

-R, set up the system account

-o,–non-unique allows the user to have the same UID

-p,–password password using encrypted passwords for new users

-s,–shell Shell Login Time Shell

-u,–uid UID Specifies a UID for the new user

-z,–selinux-user Seuser use a specific seuser for the SELinux user mapping

passwd GW

To increase the use of GW, one thing to note, useradd add a user, do not forget to set a password for him, or the system will not be logged on by default

(It can be unlocked with usermod-u GW and cannot be fully unlocked after version six, but manually removed in/etc/passwd!) No.

2, modify the user

usermod-d/home/test-g test2 GW

Change the login directory of the test user to/home/test and join the Test2 group, note that this is the big G.

Gpasswd-a GW test2 Add user GW to Test2 Group

gpasswd-d GW test2 the user GW Remove from a test2 group

3, delete user

Userdel GW

Remove the GW user

1, create a group

Groupadd Test

Add a test group

2, modify Group

Groupmod-n test2 Test

Change the name of the test group to Test2

3, deleting a group

Groupdel test2

Delete Group Test2

4, viewing groups

A), view the group groups where the current logged-on user is located, see Test group groups Test

b), view all groups Cat/etc/group

Creation of users and groups under Linux