How to manage Linux user password policy: Use the chage command

Title: Linux chage command: A powerful tool for managing user password policies

In Linux systems, protecting user account security is a crucial task. Password policy management is one of the important measures to ensure account security. In Linux systems, you can use the chage command to manage user password policies. This article will introduce in detail how to use the chage command to manage user password policies, including the settings of password expiration time, minimum change interval, number of warning days before password expiration and other parameters, and provide specific code examples.

1. Introduction to the chage command

The chage command is used to modify the password expiration information of a user account. Through the chage command, you can set parameters such as the user password expiration time, minimum change interval, and number of warning days before password expiration. The basic syntax of the chage command is as follows:

chage [options] username

2. Common options for the chage command

• -m, --mindays MIN_DAYS: Set the minimum number of days between password changes for users.
• -M, --maxdays MAX_DAYS: Set the maximum validity period of user password.
• -W, --warndays WARN_DAYS: Set the number of days before the password expires to remind the user to change the password.
• -E, --expiredate EXPIRE_DATE: Set the expiration date of the user password.
• -l, --list: Display user password expiration information.
• -d, --lastday LAST_DAY: Set the date of the last password change.

3. chage command example

3.1 Set the maximum password validity period

To set the maximum validity period of the user password, you can use the -M option, for example:

sudo chage -M 90 username

This will set the maximum password validity period for user "username" to 90 days.

3.2 Set the number of days to be reminded before the password expires

To set the number of days to be reminded before the password expires, you can use the -W option, for example:

sudo chage -W 7 username

This will be used in the user "username "Remind users to change their password 7 days before password expiration.

3.3 Set the expiration date of the password

To set the expiration date of the user password, you can use the -E option, for example:

sudo chage -E "2022-12-31" username

This will set the password of the user "username" Set to expire December 31, 2022.

4. View user password expiration information

To view user password expiration information, you can use the -l option, for example:

sudo chage -l username

This will display the user "username" Password expiration information, including the latest password change date, password expiration date, etc.

5. Summary

By using the chage command, we can flexibly manage user password policies, including setting the maximum password validity period, the number of reminder days before password expiration, etc. Properly setting password policies can improve system security and protect user accounts. Hopefully this article will help you better understand how to use the chage command to manage user password policies.

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