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Change the UID

Posted on 2008-10-02
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Last Modified: 2012-05-05
How do I change the UID of a user on Unix
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Question by:jdenver47
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10 Comments
 
LVL 45

Expert Comment

by:sunnycoder
ID: 22624159
Hello jdenver47,

 usermod  -u  

Regards,

sunnycoder
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LVL 40

Accepted Solution

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omarfarid earned 500 total points
ID: 22624272
if you want to change the user id (the number then use

usermod -u new_uid login_name

If you want to change the user login name then use

usermod -i new_login_name login_name (this is current user login name)

OR

you may edit the /etc/passwd /etc/group and /etc/shadow files and do the required changes (which you should do carefully)
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Author Comment

by:jdenver47
ID: 22624551
I have tried this but the user have some of the processes running and also he is accesing the NFS mounts..
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LVL 45

Expert Comment

by:sunnycoder
ID: 22624579
From the man page
>You must make certain that the named user is not executing any processes when this command is being executed if the user's numerical user ID is being changed.<
You need to ask the user to logout.
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Expert Comment

by:omarfarid
ID: 22624629
why do you need to change the user id?
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Author Comment

by:jdenver47
ID: 22624743
We have set up an NFS mount and the mount is shared between Linix and AIX. The mount has an application which switches the users from one system to another. Both the systems have same user's. So one user wants to communicate with other, Its a fundamental thing that they need to have same UID and GID. But both are different
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LVL 4

Expert Comment

by:ckozloski
ID: 22639547
vipw
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Author Comment

by:jdenver47
ID: 22645749
Does Anyone has a script to do this...
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LVL 45

Expert Comment

by:sunnycoder
ID: 22645990
Its a single command but you have to log off the user.
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LVL 4

Expert Comment

by:ckozloski
ID: 22646039
if you use vipw, that will allow you to mid god and hid for whatever user you have on the box. You shouldn't need a script.
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