Upload a file with a comma in its name with curl

You have not said what OS you are using. The following solutions work for Linux (not only for curl but most kinds of escaping:

• Put the file name in quotes (you need to escape them as well):

  curl --progress-bar -F "fileUpload=@\"yes, this filename has a comma.txt\"" 
  

• Escape the comma

  curl --progress-bar -F "fileUpload=@yes\, this filename has a comma.txt"