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How to automatically close an application on shutdown (graceful close, not kill)?

I try to call wmctrl -c "App" in powerbtn.sh, but it does not work. The same wmctrl command works perfectly when typed in terminal or called from a script without superuser rights.

Why does it not work in powerbtn.sh and how to fix it?

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A normal shutdown gracefully closes all processes anyway - that is, it calls SIGTERM on them, then waits for them to terminate - SIGTERM being the normal way of telling a process to close and allowing it to do any clean-up work necessary before actually terminating.

That is, you don't need to worry about doing this.

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