Transferring a file from one UNIX server to another

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http://www.unix.com – Hi, Is there a way to transfer a file from one unix server from another without entering the login credentials. I know scp and other commands but it prompts the username/password. However in my script i have a file, who i need to send to another unix server where the content of that file will be processed. Also i was thinking if we write a script on the destination server which can accept the file i will send from the source server. But i am not sure how to pass and accept the particular file. Can someone help? (HowTos)