Learn more about the usage of Linux chage command

Detailed explanation of how to use the Linux chage command

In the Linux system, the chage command is a tool used to change the user account and password expiration information. By using the chage command, you can set the password expiration time, modify the account lock date, and view account and password expiration information. This article will introduce in detail how to use the chage command in Linux systems, and provide specific code examples to help users better understand and master this powerful command.

1. Basic syntax of chage command

The basic syntax of chage command is as follows:

chage [选项] 用户名

2. Description of common options of chage command

• -d, --lastday Date: Set the date of the last user password change.
• -E, --expiredate date: Set the expiration date of the user account.
• -I, --inactive days : Set the number of days after the user password expires that the account will be temporarily locked.
• -l, --list: View user password details.
• -m, --mindays Number of days: Set the minimum number of days interval for users to change passwords.
• -M, --maxdays Number of days: Set the maximum number of days that the user password is valid.
• -R, --root CHROOT_DIR: Execute chage in the specified directory.

3. Chage command usage example

3.1 Set the account password expiration time

To set the password expiration time of the user account, you can use the following command:

chage -M 90 用户名

This command sets the password expiration time of the user account to 90 days.

3.2 View user password expiration information

To view the password expiration information of a user account, you can use the following command:

chage -l 用户名

This command will display the password expiration information of the user account Information, including the date the password was last modified, the number of days the password expires, the minimum number of days between password modifications, the maximum number of days the password is valid, etc.

3.3 Set the account lock date

To set the lock date of the user account, you can use the following command:

chage -E YYYY-MM-DD 用户名

This command will set the user account to be locked after the specified date .

4. Notes

• When using the chage command, you need to have root permissions to operate.
• When setting the expiration time of the account password, the expiration time should be set reasonably according to the actual situation to ensure account security.
• When modifying the account lock date, you should handle it with caution to avoid accidentally causing the account to be locked and unable to log in to the system normally.

Through the above introduction, I believe readers will have a clearer understanding of how to use the chage command in Linux systems. We hope that the code examples provided in this article can help readers better master and apply the chage command and improve the efficiency and security of system account management.

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