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This article introduces the relevant knowledge of "what is the concept of uid in linux". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

UID means "user identification code" in linux. UID is "User ID", which corresponds only to the user name; the UID that starts the process is the UID of the logged-in user. You can use the "id-u" command to view the user UID and use the "usermod-u" command to modify the UID.

The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

What does uid mean in linux

UID is User ID, the user identification number.

UID--- user identification number, which uniquely corresponds to the user name. The UID of superuser root in LINUX is 0. If you want the system to display your user name, UID, group name, GID, and the names of other groups to which you belong, you can use the id command. Usermod-u is generally used to modify UID.

UID is the identifier used to represent the user in the system. The uid of the started process is the uid of the currently logged-in user. You can use the id-u command to view the user uid.

It should be noted that when checking permissions, the euid is checked, and usually the euid of the process is the same as the uid.

Users whose UID is greater than 500are all non-system accounts, while those with less than 500are reserved for the system, such as root account. The UID of the most privileged account is 0. When we create users, the default UID of the account is greater than 500. if you want to specify the UID of the account, you can use the parameter-u. Nothing else makes much sense.

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