Linux Basic Article-usermod command detailed

Reference: Usermod manpage

Usermod-Modify user account information modify a user accounts

usermod [Options] Username

Option (Options)

-a|--append # #把用户追加到某些组中, only used with the-G option

-c|--comment # #修改/etc/passwd file Fifth paragraph comment

-d|--home # #修改用户的家目录通常和-m option used together

-e|--expiredate # #指定用户帐号禁用的日期, Format yy-mm-dd

-f|--inactive # #用户密码过期多少天后采用就禁用该帐号, 0 means the account is disabled after the password has expired-1 means disable this

function, default value is-1

-g|--gid # #修改用户的gid, reorganization must exist

-g|--groups # #把用户追加到某些组中, use only with-a option

-l|--login # #修改用户的登录名称

-l|--lock # #锁定用户的密码

-m|--move-home # #修改用户的家目录通常和-D option with

-s|--shell # #修改用户的shell

-u|--uid # #修改用户的uid, the UID must be unique

-u|--unlock # #解锁用户的密码

Example (Examples):

1, new user test, password test, plus add root group

[Email protected] ~]# Useradd test

[Email protected] ~]# echo "Test" | passwd--stdin Test

Change the password for the user test.

PASSWD: All the authentication tokens have been successfully updated.

2, add test user to Newtest Group

# #多个组之间用空格隔开

[Email protected] ~]# Usermod-ag newtest test

[[email protected] ~]# ID test

uid=500 (test) gid=500 (test) group =500 (test), 501 (newtest)

3, modify the test user's home directory

[Email protected] ~]# Usermod-md/home/jameszhan test

4, modify user name Test>jameszhan

#usermod-L Jameszhan (new user name) test (original user name)

[Email protected] ~]# usermod-l Jameszhan test

5, lock User-L

[Email protected] ~]# usermod-l Jameszhan

6, unlocking the user-U

[Email protected] ~]# usermod-u Jameszhan

7, modify the user's shell

[Email protected] ~]# usermod-s/bin/sh Jameszhan

8, modify the UID of the user

[[email protected] ~]# usermod-u 502 Jameszhan (UID must be unique)

[[email protected] ~]# ID Jameszhan

uid=502 (Jameszhan) gid=500 (test) groups=500 (test), 501 (usertest)

9, modify the user's GID

[Email protected] ~]# GROUPADD-G 502 Test1

[Email protected] ~]# USERMOD-G 502 Jameszhan

[[email protected] ~]# ID Jameszhan

uid=502 (Jameszhan) gid=502 (test1) groups=502 (test1), 501 (usertest)

10, specify the account expiration date

[Email protected] ~]# usermod-e 2017-11-14 Jameszhan

11, specify the user account password expires 7 days after the account is disabled

[Email protected] ~]# usermod-f 7 Jameszhan

Note (caution):

Usermod is used to change the UserID, it must be confirmed that the user does not perform any program on the computer

[Email protected] ~]# tail-1/etc/passwd

Jameszhan:x:500:500::/home/jameszhan:/bin/bash

[Email protected] ~]# tail-1/etc/shadow

jameszhan:$6$vuybok4e$6h5449gk3qjjfnabu3zvwfge422poazhjwkybmyiisyyfnv3/w0rksnxqbjxjytvy/.xdse.h7uytzlofcajv/ : 17119:0:99999:7:::

User name: password: Last time password change: Minimum age: Maximum Age: Warning Time: Expiry time

Note:

Last password change: The number of days since January 1, 1970 to the time the password was last modified

Minimum period of use: the password can be changed in a few days (0 means it can be changed at any time)

Maximum lifespan: Passwords must be changed in a few days (99999 means never expire)

Warning Time: A few days before the password expires remind the user (default is one week)

: Password expires several days payback number is disabled

: expiry date: From January 1, 1970, number of days after the account expires

This article is from the "James Zhan Linux Advanced ops" blog, so be sure to keep this source http://jameszhan.blog.51cto.com/10980469/1872751

Linux Basic Article-usermod command detailed