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The content of this article mainly focuses on how to analyze Linux system user ID and user group ID, the content of the article is clear and easy to understand, clear organization, very suitable for beginners to learn, worth reading. Interested friends can read along with Xiaobian. I hope everyone gets something out of this article!

UID: When UID value is 0, it means system administrator;(1-99) is system preset account;(100-499) is reserved for some services;(500-65535) is for general users

Enter cat /etc/passwd in the terminal| grep your username command query UID and GID

user UID and GID are 1000:1000 respectively

setuid, setgid can change this setting. setuid: Sets the file to have the file owner's permissions during execution. A typical file is/usr/bin/passwd. If the file is executed by an average user, the file can gain root privileges during execution, allowing the user's password to be changed.

setgid: This permission is valid only for directories. When this bit is set, any files created by users in this directory will have the same group as the group to which the directory belongs.

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