Thread: how to enable a user and disabling a user

could any one help me in finding the script for enabling and disabling a user

i have gone thru the material saying tht we need to add a * at the passwd file
but i am unable to preform it
please
can any one helpme in getting the code ...
urgent

No need to put *. use following command to lock user account

Code:

passwd  -l {user-name}

To unlock user account

Code:

passwd  -u {user-name}