Learn how to view user UID and GID in Linux

Learn how to view user UID and GID in Linux

In the Linux system, each user and group has a unique identifier, namely user ID (UID) and group ID (GID). It's important to know how to view these IDs because they play a key role in permission management and file access control. With some simple commands, we can easily query the UID and GID of users and groups. Let's take a look at the specific methods and code examples.

1. View the UID and GID of a single user

To view the UID and GID of a single user, we can use the id command. Just enter the following command in the terminal:

id <username>

For example, to view the UID and GID of user Alice, you can enter:

id alice 

The system will return information including the UID, GID and other groups to which user Alice belongs. This allows us to quickly understand the user's identification information.

2. View the UID and GID of the current user

If you want to view the UID and GID of the currently logged in user, you can directly use the id command, no A username needs to be specified. Just enter the following command:

id

The system will return the UID, GID and other group information of the current user. This is very convenient for quickly viewing your user identification information.

3. View other groups to which the user belongs

In addition to viewing the user's UID and GID, sometimes we also need to know information about other groups to which the user belongs. You can use the following command:

groups <username>

For example, to view other groups to which user Alice belongs, you can enter the following command:

groups alice

The system will return information about all groups to which user Alice belongs, which can help us better understand the user's permission distribution.

The above is the method and code example for viewing user UID and GID in Linux system. Through these simple commands, we can easily understand the identification information of users and groups, which helps us better manage permissions and file access control. Hope this article helps you!

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