(lilypond "$*"&&  echo Success) || echo Failed
1. Lilypond is a multi-OS application, it doesn't just run under bash on a Linux-derived OS (e.g cmd on Windows, running from detached "gui" environment from JEdit or Frescobaldi - btw JEdit could also be running under Windows).
Doesn't LilyPond correctly return an error code upon exit? Then the GUI apps could easily show this message.

Bert



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