[Bird Brother Linux Video tutorial finishing]04_01_linux user management commands in detail

First, user management:

1. Add User: useradd [option] USERNAME

-u:uid

-g:gid (Basic Group)

-g:gid,.. (Additional groups)

-C: "COMMENT"

-d:/path/to/somedirectory

-s:shell

-m-k:

-M:

-R: Adding system users

Environment variables:

PATH:

Histsize:

Shell:echo $SHELL

2. Delete User: Userdel [option] USERNAME

-r: Delete User's home directory at the same time

3. ID: View user's account attribute information

ID [option] USERNAME

-U:

-G:

-G:

-N:

Finger: View user account information

Finger USERNAME

Second, modify user account information:

1.usermod:

-u:uid

-g:gid

-a-g:gid does not use the-a option, overwriting the previous additional group

C:

-d-m:

-S:

-L:

-L: Lock account

-U: Unlock Account

2.chsh: Modify the user's default shell

3.CHFN: Modify annotation information

Third, password management:

passwd USERNAME

--stdin

-L:

-U:

-D: Remove user password

PWCK: Checking user account Integrity

Four, group management:

1. Create Group: Groupadd

-g:gid

-R: Added as System group

2. Modify Group: Groupmod

-g:gid

-n:grpname

3. Delete Group: Groupdel

4. Set the password for the group: GPASSWD

5.newgrp GRPNAME <--> Exit

V. Change

-D: Last modification time

-E: Expiration time

-I: Inactive time

-M: Minimum period of use

-M: Maximum lifespan

-W: Warning time

Practice:

1. Create a user Mandriva with an ID number of 2002, a base group of distro (group ID 3003), and an additional group of Linux

#:groupadd-g 3003 distro

#:groupadd Linux

#:useradd-u 2002-g distro-g Linux Mandriva

2. Create a user fedora with the full name of Fedora Community, the default shell is tcsh

#:useradd-c "Fedora Community"-s/bin/tcsh Fedora

3. Modify Mandriva with ID 4004, Basic Group Linux, additional group distro and Fedora

#:usermod-u 4004-g linux-g Distro,fedora Mandriva

4. Add a password to Fedora and set its password to a minimum of 2 days and a maximum of 50 days

#:usermod-n 2-x Fedora

5. Change the default shell of Mandriva to/bin/bash

#:useradd-s/bin/bash Mandriva

6. Add the System user group HBase and do not allow login system

#:useradd-r-s/bin/nologin HBase

This article is from the "Linux Blind Advanced Road" blog, please be sure to keep this source http://blindbird.blog.51cto.com/12338383/1879654

[Bird Brother Linux Video tutorial finishing]04_01_linux user management commands in detail