How can I use $HOME or ~/ in my log paths of launchd plist to run as LaunchAgent

I think the user home directory is the default working directory for launch agents. Try it and see.

The fact that launchd agent property lists have no good way to specify home-relative paths is a well-known limitation. There are two ways you can deal with this:

• Not print to

  stdout

  and

  stderr

  — Daemons and agents are meant to be headless. We recommend that such programs log to the system logging facility, which is currently <os/log.h>.

• Redirect

  stdout

  and

  stderr

  yourself — If you absolutely have to print to

  stdout

  and

  stderr

  , you can redirect them to a destination of your choice using

  dup2

  .

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—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"