How to Retrieve User IDs in Ubuntu Linux
A User ID (UID) in Ubuntu Linux is a unique number that the system assigns to every account to control access to files and programs. Finding these numbers takes just a second using the built-in terminal.
Run the `id -u` command in your terminal to instantly see your own UID number. Type `getent passwd` to view a complete list of UIDs for every account set up on your Ubuntu system.
You can find your user ID by opening the terminal and typing `id`. To see all user IDs, use `lslogins -u` or `getent passwd `.
Get UID for Users on Ubuntu Linux
Ubuntu Linux assigns a User ID (UID) to keep track of each individual account.
Execute the `id` command shown below to find the current user ID.
id
Output resembling this text appears on screen:
uid=1000(richard) gid=1000(richard) groups=1000(richard),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),122(lpadmin),134(lxd),135(sambashare)
Use the lslogins command to find the User ID
Running `lslogins -u` in the terminal outputs a comprehensive list pairing usernames with their corresponding UIDs. This command retrieves user IDs for multiple people on the system at once.
Execute the `lslogins` command below to list all UIDs present on the system.
lslogins -u
The terminal generates lines matching this format:
UID USER PROC PWD-LOCK PWD-DENY LAST-LOGIN GECOS 0 root 205 0 1 root 1000 richard 80 09:41 Richard
Get User IDs using the getent command
The `getent` utility checks system user details stored in the /etc/passwd file to locate a single account's identifier. Run `getent passwd
getent passwd <username>
This command queries information located in /etc/passwd.
Querying the UID for an account named geekrewind requires running the command below.
getent passwd geekrewind
A single line returns containing the user details, where the third column displays the UID.
richard:x:1000:1000:Richard,,,:/home/richard:/bin/bash
Alternative methods exist for retrieving UIDs, but these commands provide a solid starting point for system administration.
Conclusion:
- Understanding the concept of User ID or UID and its importance in Ubuntu Linux
- Learning multiple methods to retrieve User IDs for individual users and all users on the system
- Exploring commands like id, lslogins, and getent to obtain user IDs efficiently
- Enhancing user management and tracking capabilities on Ubuntu Linux through UID retrieval
- Encouraging further exploration and utilization of additional methods for obtaining user IDs or UIDs in Ubuntu Linux
Where is the user ID stored in Linux?
UID (User Identifier) in Linux is a unique numerical value assigned to each user account, helping identify and differentiate users. The UID is stored in the system's user database, usually in the /etc/passwd file, along with other user details.
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About the Author
Richard
Tech Writer, IT Professional
Richard, a writer for Geek Rewind, is a tech enthusiast who loves breaking down complex IT topics into simple, easy-to-understand ideas. With years of hands-on experience in system administration and enterprise IT operations, he’s developed a knack for offering practical tips and solutions. Richard aims to make technology more accessible and actionable. He's deeply committed to the Geek Rewind community, always ready to answer questions and engage in discussions.
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