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-w Xin the second case, the subsequent job can be made to wait up to X seconds for the first job to finish and fail if the first job is not done within that time, which may be preferred to waiting indefinitely for the previous job to finish.flock -n ... || logger -t unison "skipping because lock file"should work just fine (we’ll see tomorrow if stopping any further instances actually works). Any changes made during that time will get picked up by the next sync job after the first one finishes.