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How to change uid and gid in linux.
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How to (Correctly) Change the UID and GID of a user/group in Linux
Changing the UID and GID of a user might seem a trivial task to most of the system admins. But it’s not so trivial and it involves a lot more changes in the backend.
In this post, we have outlined the exact steps to change the UID and GID of a user “user01”.
Username: user01 Group: group01 Existing UID: 800 Existing GID: 700 New UID: 900 New GID: 600
Pre-requisites
1.
Make sure the user for which UID and GID is to be changed is currently not having any active process running in the system.
Change gid of userTo check the same use “ps” command. For example:
# ps -ef | grep user01 # ps -ef | grep 800
Note: In the “ps -ef” command UID are displayed. So make sure you grep for UID as well as the username for the user.
2.
Take the backup of important files where UID and GID related information is stored.
How to change user id in linux command
i.e. /etc/passwd and /etc/group.
# cp -p /etc/passwd /etc/passwd.bkp # cp -p /etc/group /etc/group.bkp
3. Verify the exisitng UID and GID of the user using the “id” comma
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