"Translating" a POST File-Upload HTML to a curl command line

I guess this should be pretty simple but I can't seem to get it working, plus googling is not getting me anywhere... The HTML code is this:

<FORM ENCTYPE="multipart/form-data" METHOD="POST" ACTION="/Forms/Config_3">
<INPUT TYPE="FILE" NAME="FileUpload" SIZE="15" MAXLENGTH="15">
<INPUT TYPE="SUBMIT" NAME="UPDATE_BUTTON" VALUE="Update" VALUE="Change">

How can I tu开发者_Python百科rn this into a curl command line?

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Something like:

curl -F "FileUpload=@filename.txt" http://DOMAINNAMEHERE.COM/Forms/Config_3