How does id command work? Using the id Command
If the username is omitted, the id command displays information about the currently logged-in user. When invoked without any option, id prints the real user ID ( uid ), the user’s real primary group ID ( gid ), and real IDs of the supplemental groups ( groups ) the user belongs to.
What is my id Linux? You can find the UID in the /etc/passwd file, which is the file that also stores all users registered in the system. To view the /etc/passwd file contents, run the cat command on the file, as shown below on the terminal.
How do I run a Linux id? You can use the “-r” command with -u, -g, and -G options to display real id instead of effective id on the terminal. As you can see, we can get real ids with and without the username command.
What is id in Shell? Prints the user id (gid) and group id (gid) of the user that is running the command. Additionally, it also prints all groups that the user belongs to.