Linux Practical Tips: How to Find User UID and GID

Linux Practical Tips: How to Find User UID and GID

In the Linux system, each user is assigned a unique user ID (UID) and a group ID (GID). These IDs Used to identify users and user groups. Sometimes, we need to find the UID and GID of a specific user for management or configuration. This article will introduce how to find user UID and GID in Linux system, with specific code examples.

1. Use the id command

The id command can display the UID, GID and user group information of the current user. If you want to find the UID and GID of other users, you can do so by specifying the username.

$ id

If you want to find the UID and GID of a specific user (for example, the username is alice), you can use the following command:

$ id alice

2. Use the getent command

The getent command can retrieve and display the information of the specified user or group from the system database. Through the getent command, you can easily find the user's UID and GID.

$ getent passwd alice

The above command will display the detailed information of user alice, including UID, GID, etc.

3. Use the grep command

Sometimes, we can get the user's UID and GID by viewing the /etc/passwd file. This requirement can be easily achieved through the grep command and the /etc/passwd file.

First, use the grep command to find the relevant information of a specific user (such as alice) in the /etc/passwd file:

$ grep alice /etc/passwd

The above command The row containing user alice's information will be displayed, including the user's UID and GID.

4. Use the awk command

Using the awk command can more conveniently extract the user's UID and GID from the /etc/passwd file.

$ awk -F':' '/alice/ {print "UID: " $3 ", GID: " $4}' /etc/passwd

The above command will read from /etc/passwd Find the line containing user alice in the file and output the user's UID and GID.

Through the above method, we can easily find the UID and GID of a specific user to facilitate management and configuration of the system. In Linux systems, knowing the UID and GID information of users and groups is very useful for system administrators and developers. I hope the tips introduced above are helpful to you.

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