ftp configuration

Hi,
I have been a unix box testing machine and I access to it through putty with my creditials now I have an sftp script to transfer files from that machine to some other ftp server but recently I come to know that due to some reason ftp server is not ready so I have to make my current machine itself to make it act like a ftp server..can you please guide me how to configure the current unix box machine to act like a ftp server itself so that I can cross check my sftp script locally..!!:confused: