usermod -d /path user - User is currently logged in

I ran into this. The user was not logged in according to w, but a ps aux | grep username showed an imap process running as the user. The usermod command ran successfully after the imap connection was closed.

One way to kick the user is by doing the following:

# w
damaya   pts/5     23:20    1.00s  0.00s  0.00s w

As we can see from "w" output, user damaya is logged in on pts/5. Now type:

# fuser -k /dev/pts/5

That will kick the user off and you can now modify their account.

I would first lock the user account that he will be not abble to log in after you log out him.

passwd -l username

This command will block user.

If he is still logged in then uou can log him out with

skill -KILL -u username

After that you can modify his path to home dir and unlock account with

passwd -u username