Disclaimer 1: Unix systems only- I know nearly nothing about Windows, but maybe something similar can be done. I have no idea. Tested only on Linux, but should work for Macintosh OS by Apple Computers, I presume.
Disclaimer 2: As far as I can tell, this does not disrupt the native -U flag that comes with rclone, when being used with regular commands. (Since this is used only by itself)
Copy this to ~/.bashrc
rclone() { if [[ $@ == "-U" ]]; then command curl https://rclone.org/install.sh | sudo bash; else command rclone "$@"; fi; }
Save, then source ~/.bashrc
Now running rclone -U
will automatically update rclone to the latest version. Helpful for keeping updated. Could even add rclone -U to a cron job of some sort.