The title says it all. What command I need to run from a terminal to find my user ID (UID)?


There are a couple of ways:

  1. Using the id command you can get the real and effective user and group IDs.

    id -u <username>

    If no username is supplied to id, it will default to the current user.

  2. Using the enviroment variable.

    echo $UID
  • 8
    How about GID ? – kangear Oct 29 '15 at 1:11
  • 18
    @kangear id -g <username> – itsazzad Dec 18 '15 at 15:23
  • It's worth noting that, due to the fact that the variables are resolved before being passed to a command, we have that sudo echo ${UID} prints out 1000 (or whatever your sudoer user's UID is), whereas sudo id -u prints out 0. – AnthonyD973 Dec 19 '18 at 20:33
  • The username is optional, defaulting to yourself. Maybe square brackets would be better for indicating this, instead of angle brackets. – mwfearnley May 13 '19 at 15:44
  • The second part of this answer is wrong. The variable in question is explicitly not an environment variable. It's a shell variable. Big difference. You can see this with echo $UID versus env|grep ^UID in Bash, for example. This means in particular that the first method is more robust and the second will only work in shell scripts, not - say - in something like Python (python -c 'import os; print(os.environ)' to see the environment). – 0xC0000022L Dec 16 '20 at 15:39

Simply try


This will return your user ID, group ID, and all your groups.

  • 11
    or id -u to see just the UID – steeldriver May 17 '14 at 13:21
  • Yepp. Prefer Jobin's answer, if you need to avoid parsing the output. – TAq May 17 '14 at 13:25
  • 3
    so much easier with id -u and id -g. Thanks. :) – thoroc Aug 3 '17 at 17:00

Try also :

getent passwd username

This will display user id , group id and home directory .


grep username /etc/passwd
  • why to try long or alternative command while echo $UID and id -u is simple and exact according to question? – Pandya May 17 '14 at 13:37
  • 5
    thats right , but its good to know all options – nux May 17 '14 at 13:38

You can use id command.


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