Correct syntax to upload file in a script using sftp

I just had a vendor change their server from ftp to sftp.
I was using the following code in my script:
ftp -in $HOST <<- EOF
    user $USER $PASS

But was told this wouldn't work anymore since I now have to connect using the sftp command.
Can someone let me know what the proper syntax I need to use in order to upload a file to a sftp server.
metalteckAsked:
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Hanno P.S.IT Consultant and Infrastructure ArchitectCommented:
If you have to use sftp it looks like you will be using ssh to transfer files.
Maybe, using scp (Secure CoPy) instead would be much easier.

Anyway, to use sftp the syntax would be something like:
sftp sourcefile user@host:targetfile
see: man sftp

For non-interactive use scp should be used instead:
scp sourcefile user@host:targetfile

If you use secret keys for authentivcation, no password will be needed anymore.
Duncan RoeSoftware DeveloperCommented:
According to my copy of the man page, to send files from a script you need to use
sftp -b batchfile [user@]host
You must configure non-interactive authentication before using sftp -b. The man page refers you to sshdssh-keygen for instructions.
The format would then be along the lines of
sftp -b - ${USER}@${HOST} <<////
put ${file_to_go}
qui
////

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The curly brackets may or may not be necessary.
I always use a four-slash terminator (don't ask ...)

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