I know I can do curl https://rclone.org/install.sh | sudo bash in order to get and install the latest version and that procedure usefully aborts, with an informative message, if I have the latest version already. However, it would be useful if one could fetch just the version number of the current version from web. That way I could skip the download were I up to date already.
Right. Thanks. I was confusing the install.sh script with the whole rclone code. In fact, the script is just a little script and it will download rclone only if necessary. I suppose I was encouraged to my mistake by curl's download progress meter.