Remove a user from a group
net localgroup <group name> <user> /delete
e.g. C:\> net localgroup Administrators savillj /delete
How to add user to a group
net localgroup administrators anormalUser /add
Change or reset domain user password with command
net user [username [password|*] /domain
Example: net user iSunshare Abc12345 /domain
Delete/remove domain user with net user command
net user [username] /delete /domain
Example: net user iSunshare /delete /domain