Learn more about how to modify Linux user information

Title: Detailed explanation of how to modify Linux user information

In the Linux operating system, the management of user information is a very important operation. User information includes user name, user ID, user group, user home directory, user shell, etc. Understanding how to modify user information is crucial for system management. This article will introduce in detail how to modify user information in Linux systems, and attach specific code examples.

1. View user information

Before you start modifying user information, you first need to know how to view user information. You can view the information of all users in the system through the following command:

cat /etc/passwd

This command will list the information of all users in the system. Each user information is separated by a colon, including user name, password placeholder, and user ID. , the group ID to which the user belongs, user description, user home directory, user shell, etc. By viewing this file, you can learn basic information about all users in the system.

2. Modify user information

1. Modify user information command:

sudo usermod -c "新描述" -d /新家目录 -s /新shell -u 新用户ID 用户名

• -c: Modify user description
• -d: Modify the user's home directory
• -s: Modify the user shell
• -u: Modify the user ID

2. For example, if you want to change the user test The description is changed to "test user", the home directory is changed to /home/test_new, the shell is changed to /bin/bash, and the ID is changed to 1001, you can use the following command:

sudo usermod -c "测试用户" -d /home/test_new -s /bin/bash -u 1001 test

This command User test's information will be modified to the specified content.

3. Other user information management commands

1. Modify user password:

sudo passwd 用户名

Use this command to modify the password of the specified user.

2. Delete user:

sudo userdel 用户名

Use this command to delete the specified user.

3. Add user:

sudo useradd -m -s /bin/bash 新用户名

You can add a new user through this command. The -m option means to create a home directory when creating the user.

4. Example

Suppose we want to modify the information of user test, first check the original information of user test:

grep test /etc/passwd

The original information obtained is:

test:x:1000:1000:,,,:/home/test:/bin/bash

Then modify the user information:

sudo usermod -c "测试用户" -d /home/test_new -s /bin/bash -u 1001 test

Check the information of user test again:

grep test /etc/passwd

You can see that the information of user test has been modified.

Through the introduction of this article, readers can learn how to manage user information in the Linux system, including operations such as viewing, modifying, adding and deleting user information. It is very important for system administrators to be proficient in these operations. I hope this article can be helpful to readers in Linux user information management.

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