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How to get the username if I know only the user's UID?

 
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# 1  
Old 03-10-2010
How to get the username if I know only the user's UID?
Hi,

I know the user's UID, but I need to know the user's username which has this UID. How can I do it?? Any ideas?

Thanks!
# 2  
Old 03-10-2010
Code:
$ grep 'UIDnumber' /etc/passwd

Is this OK?
# 3  
Old 03-10-2010
Quote:
Originally Posted by tukuyomi
Code:
$ grep 'UIDnumber' /etc/passwd

Is this OK?
That's OK if it's a local user (i.e. not an AD user, etc.)

I think
Code:
getent passwd

might yield more success.

i.e.
Code:
/root # getent passwd 0
root:x:0:0:root:/root:/bin/ksh

(I think it works with non-local users, etc... can't remember, need to check Smilie)
# 4  
Old 03-10-2010
Bug To find a particular UID
The uid is normally the third field in /etc/passwd. Thus, to find username for uid=1000
Code:
awk -v val=1000 -F ":" '$3==val{print $1}' /etc/passwd

# 5  
Old 03-10-2010
The grep solutions could return multiple answers.
If there is a user with uid 123 and another user with uid 1123.
# 6  
Old 03-10-2010
joeyg's awk solution is in post #4 works perfectly.
# 7  
Old 03-12-2010
Yes, the awk solution in post #4 works perfectly!

Thanks a lot!!
 
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