error [2002]can't connect to MySQL server through socket '/tmp/mysql.sock'

hey,

I have installed mysql on my CentOs system. and it installed succefully.
but when i m trying to login into it with command " mysql -u root -p " , it gives this error

error[2002]can't connect to MySQL server through socket '/tmp/mysql.sock'

plz plz help me to solve this problem.

pratik.
pratik@netedgetechnology.net