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In this article, the editor introduces in detail "how to use the Linux chage command", the content is detailed, the steps are clear, and the details are handled properly. I hope this article "how to use the Linux chage command" can help you solve your doubts.

Introduction to the linux chage command:

The chage command is used for password utility management, which is the validity period for changing accounts and passwords. It can change the validity period of the account and password. The description of the chage command is as follows:

The chage command changes the number of days between password changes and the date of the last password change. This information is used by the system to determine when a user must change his/her password

Command syntax:

Chage [options] user

Command parameters:

Parameters.

Description

-d

Specify the date when the password was last modified

-e

The date on which the password expires, after which this account will not be available. 0 means it expires immediately, and-1 means it never expires.

-h

Display help information and exit

-I

The number of days after the password expires and the account is locked

-l

List the user and the validity period of the password

-m

The minimum number of days that the password can be changed. Zero means that the password can be changed at any time.

-m

The maximum number of days that the password remains valid.

-w

The number of days before the password expires that the warning message is received in advance.

Examples of use:

1: view help information for the chage command

[root@db-server ~] # man chage

[root@db-server ~] # info chage

[root@db-server] # chage-h

Usage: chage [options] user

Options:

-d,-- lastday last_day set last password change to last_day

-e-- expiredate expire_date set account expiration date to expire_date

-h,-- help display this help message and exit

-I-- inactive inactive set password inactive after expiration

To inactive

-l,-- list show account aging information

-m,-- mindays min_days set minimum number of days before password

Change to min_days

-m,-- maxdays max_days set maximim number of days before password

Change to max_days

-W,-- warndays warn_days set expiration warning days to warn_days

2: check the validity period of mysql users and passwords

[root@db-server ~] # chage-l mysql

Last password change: mar 26, 2015

Password expires: never

Password inactive: never

Account expires: never

Minimum number of days between password change:-1

Maximum number of days between password change:-1

Number of days of warning before password expires:-1

[root@db-server ~] #

3: set the password of mysql users to expire 60 days later, and change the password at least 7 days later. The alarm message will be received 7 days before the password expires.

[root@db-server] # chage-m 60-m 7-w 7 mysql

You have new mail in / var/spool/mail/root

[root@db-server ~] # chage-l mysql

Last password change: mar 26, 2015

Password expires: may 25, 2015

Password inactive: never

Account expires: never

Minimum number of days between password change: 7

Maximum number of days between password change: 60

Number of days of warning before password expires: 7

[root@db-server ~] #

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4: force new users to change their passwords when they log in for the first time

[root@db-server home] # useradd test

[root@db-server home] # passwd test

Changing password for user test.

New unix password:

Retype new unix password:

Passwd: all authentication tokens updated successfully.

[root@db-server home] # chage-d 0 test

You have new mail in / var/spool/mail/root

[root@db-server home] # chage-l test

Last password change: password must be changed

Password expires: never

Password inactive: never

Account expires: never

Minimum number of days between password change: 0

Maximum number of days between password change: 99999

Number of days of warning before password expires: 7

Next, I would like to introduce the linux chage command.

Function: modify the validity period of account and password

Usage: chage [- l] [- m mindays] [- m maxdays] [- I inactive] [- e expiredate] [- w warndays] [- d lastdays] username

Parameters:

-l: list the user's and the validity period of the password

-m: the minimum number of days to change the password

-m: the maximum number of days to change the password

-I: the number of days that the account is locked after the password expires

-d: specify the date on which the password was last modified

-e: validity period. 0 means immediate expiration, and-1 means never expire.

-w: the number of days before the password expires

Read here, this "how to use Linux chage command" article has been introduced, want to master the knowledge of this article also need to practice and use to understand, if you want to know more about the article, welcome to follow the industry information channel.

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