Does anyone know how do I list existing alias for a certain Unix/Linux user on Debian? For example I have an Unix/Linux user 1001 and want to know which alias for login it has?


I assume you have a user with a numerical user id (uid) of 1001 and want its user name:

getent passwd 1001 

will show this information.


If it's a local user you can grep /etc/passwd for it. Like following:

grep 1001 /etc/passwd

If it's a non-local user, it depends on the DB backend that is used to store him in. For example if you use NIS you may check with ypcat:

cd /etc
ypcat passwd | grep 1001

For other DB backends you'll have to check the specific ways to search for a user by UID.

  • 2
    See my approach. This will work with LDAP, NIS etc.
    – Sven
    Aug 27 '13 at 10:11
  • This isn't good. What if there is a UID 1001 and a UID 11001?
    – jordanm
    Aug 27 '13 at 21:20

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