Learn the parameters and usage of Linux chage command

Title: In-depth understanding of the parameters and functions of the Linux chage command

As one of the most popular operating systems in the world, the Linux operating system has powerful functions and flexibility Popular among users. In Linux systems, the chage command is a very useful tool for managing user information such as password expiration and account expiration. Through this command, administrators can easily control users' password policies and enhance system security. This article will delve into the parameters and functions of the Linux chage command, as well as provide specific code examples to help readers better understand and use the command.

1. Overview of the chage command

The chage command is mainly used to modify user password expiration information, including the number of days before password expiration, password expiration time, account expiration time, etc. Through the chage command, administrators can flexibly customize user password policies to improve system security.

2. Detailed explanation of chage command parameters

When using the chage command, you can specify different parameters to achieve different functions. The following are several commonly used chage command parameters:

• -l: Display the user's password expiration information.
• -E: Set the expiration time of the account.
• -M: Set the password validity period.
• -m: Set the password modification interval.
• -W: Set the number of warning days before password expiration.
• -I: Set the expiration time when the account is inactive.
• -d: Set the time of the last password change.

3. chage command example

The following uses several specific code examples to demonstrate how to use the chage command:

Example 1: View user password expiration information

chage -l user1

This command will display the password expiration information of user user1, including the last password modification time, password expiration time, password validity period, password modification interval, etc.

Example 2: Set the account expiration time

chage -E 2023-12-31 user1

This command will set the account expiration time of user user1 to December 31, 2023.

Example 3: Set password validity period

chage -M 90 user1

This command will set the password validity period of user user1 to 90 days.

Example 4: Set the number of warning days before password expiration

chage -W 7 user1

This command will set the number of warning days before password expiration for user user1 to 7 days.

4. Summary

Through the introduction of this article, readers can have a deeper understanding of the parameters and functions of the Linux chage command, and master how to use this command to manage user password expiration information. In actual operation, administrators can flexibly configure users' password policies based on system requirements and security policies to improve system security. I hope this article will be helpful to readers, and you are welcome to continue to pay attention to more practical knowledge about Linux systems.

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