I have an UID, how do I get the username belongs to this UID in Linux?
How to Get UID from USERNAME in Linux
We usually know, there is a dedicated command called ‘id’ in linux given to find UID from username is called ‘
You can use that to get the UID from the username in linux:
# id -u root
How to get Username from UID in Linux
Although, there is no built in command get fetch the username from the UID. We can use a pipe and regular expression match on getent to do that.
getent is a unix command that helps a user get entries in a number of important text files called databases. This includes the passwd and group databases which store user information – hence getent is a common way to look up user details on Unix.
You can use the following command to find username of the UID 752 for example in a system:
# getent passwd "752"|cut -d: -f1
getent can take group database too, although, we have used passwd database as that contains the UID of the respective linux user.