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I want to run script when my mac is idle (for example after 5 minutes or screen saver start time is also ok) and when I resume it from idle state.

I know that I can write daemon using NSDistributedNotificationCenter and and, but I hope that there is already solution without creating new daemon.

I need this to for example turn on/off speed limit for Transmission (as it is sometimes hard to work when hashing/downloading on full speed).

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up vote 1 down vote accepted

Sleepwatcher -- See my answer to Automatically run a program when mac wakes from sleep

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I see how you can script 'sleep' events, but not when your machine goes to idle / inactive. – brianegge May 31 '11 at 15:36
From Sleepwatcher's help text: -i or --idle execute idlecommand when no user interaction (keyboard, mouse) took place in the period given with the -t option. – JRobert May 31 '11 at 16:09

Look at the batch command:

man batch
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Man page says about queueing at specific time or when load average drops below special value, nothing about idle/resume – tig May 12 '10 at 10:31

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