I saw this thread on stack Exchange
https://unix.stackexchange.com/questions/41210/redirect-terminal-output-to-image-file#41211
I think you’d write a script that turns standard output from something like khal to an image, then use a feh command to turn it into your background. But honestly it’s pretty fast to set up a keyboard shortcut to launch a terminal session and type khal
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I’m the same as you! I recommend “trash-cli”, then you can undo if you mess something up. You can even set an alias to echo “wrong command” if you use ‘RM’.