Modifying basic information about an existing user is usually quite simple. The exception to this rule is the change of a user's UID. This is sometimes necessary if a user has accounts on two different Unix systems and both systems have to identify him/her as the same person. A typical example of this situation is sharing files over NFS as we will discuss in Chapter 6, Managing Files on Your System.
Changing a UID requires an update of file ownership of all files belonging to that user. This can be quite tedious, but Webmin does the job for us.
Follow these steps for modifying a user's UID:
Navigate to System | Users and Groups, and click the username link of the account you want to edit.
On the next page, you will be able to edit all the basic user information, including the username, ID, home directory location, chosen default shell program, primary and secondary system groups, and so on.
Change User ID to a different value.
In the...
