folder full plz help me out

Disk hda5 (/) 18 %
Disk hda1 (/boot) 27 %
Disk hda8 (/home) 3 %
Disk hda7 (/tmp) 100 %
Disk hda3 (/usr) 40 %
Disk hda2 (/var) 6 %

Everything look fine expect Disk hda7 (/tmp) 100 % , I contact the host and they said delete everyting in that tmp folder and everything will be fine, I did it thru ftp but not help any so they said use ssh to check. But since I am very newbie so I have no clue what command and how to del file in tmp folder to help this Disk hda7 (/tmp) 100 % decease.
So can somebody tell me how do i make it decrease please??

 

 

 

 

Top