How to use User management and group management commands for Linux users

Useradd[options] USERNAME

- u UID Specify user ID , greater than -

- G GID ( Basic Group ), group must exist

- G GID , ...,... ( Additional group, can have multiple )

- C "COMMENT" Comment Information

- D /path/to/somedirectory Specify home directory

                      -s/bin/bash  specify shell path   SHELL environment variable ECHO $ SHELL

-m-k ( file copy in/etc/skel/to the home directory created ) force a home directory for users

ls-a/etc/skel/ Show hidden files

- M do not create home directory /etc/login.defs

- R system users, can not log on to the system, no home directory. 1-400

Environment variables:

PATH

SHELL

Histsize

Userdel: Delete User

Userdel[option] USERNAME , if you do not specify any options, the user's home directory will not be deleted '

- R: Delete a user's home directory while deleting it

ID : View the user's account attribute information.

-U user

-G Group

- G Additional groups

- N Display Name

Fingerusername need to install

the function of the Linuxfinger command is to query the user's information, typically displaying the user name, home directory, stasis time, logon time, logon Shell and other information. If you want to query the user information on the remote computer, you need to follow the user name "@ hostname", the [username @ hostname] format, but to query the network host needs to run the finger daemon.

Modify user account attribute information option with the Useradd similar

usermod [Options] USERNAME

- u Modify User ID

- G Pre-existing groups when needed   

- G previous additional groups will be overwritten. -a-g Append additional group, do not overwrite.

-C

-d-m Move the previous file to the new home directory.

-S

- L Modify LoginName

- L lock Account, disable

- u Unlock account

Chsh : Modify the user's default Shell

CHFN : Modify User's comment information

Password Management: passwd [USERNAME] administrators can modify other users ' information

--stdin: read password from standard input

Echo "Redhat" |passwd--stdin user3 Piping Create user account in script, set password

-L Lock

-U unlock

-D Delete Tail/etc/shadow

Pam

Pwck Check the integrity of user accounts

chage Modify user Password expiry time Manchage

Group Management:

Groupadd

-G GID

- R Add a system group group-r Apache Tail-1/etc/group

Groupmod

-G GID

- u Group name

Groupdelusername

gpasswd USERNAME add a password to a group

The owner of the user-created object is the basic group that the user belongs to touch ahead

Newgrp Switch to the new base group and need to log in to exit with a password

This article is from the "7489131" blog, please be sure to keep this source http://7499131.blog.51cto.com/7489131/1703871

How to use User management and group management commands for Linux users