HOWTO: Manage users¹

1) Rename user:

    usermod -l <new_username> <old_username>

2) Change user ID:

    usermod -u <UID> <new_username>  # UID in (5000, 10000)

3) Look up user info:

    id <new_username>

4) Add an existing user to an existing group:

    usermod -a -G ftp tony

HOWTO: Manage users1