How to escape spaces in systemd unit files?

The correct way to generate paths in systemd is to use systemd-escape.

i.e.

~$ systemd-escape --path "/home/cobra/my service/start.sh"
home-cobra-my\x20service-start.sh

Yes / gets replaced with -

The obvious thing to do is to use double quotes.

ExecStart="/home/cobra/my service/start.sh"

You also should get rid of the start.sh script and move any necessary logic into the unit.

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