Specifies a well-formed content type that indicates the format you want the command to use for the input. You can specify the short or full versions of the media type. The following lists some examples:

The default value is taken from the input file extension if the extension matches the short version of a supported media type. If the input file extension does not match the short version of a supported media type, the default is text/plain.

For the content types that a command supports, see the documentation for a specific command.