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How can I reinstall some system apps?

There could be different reasons for that:

  • I've removed some of my system apps and now I regret (actually not).
  • Before I brought my computer to service center to replace corrupted memory it caused erratical disc writes which not only damaged some documents that I worked on but also corrupted some system apps (the part about documents is true).
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I've found how to reinstall some of them.

  • Mount or your installation media.
  • You may have hidden BaseSystem.dmg in your installation media (for me it's in root).
  • Copy that BaseSystem.dmg somewhere and mount it to. It may contain Safari and Utilities:

BaseSystem.dmg content

  • Now you can just drag them in /Applications if you need them
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    The volume can also be mounted from Lion's recovery partition with diskutil mount "Recovery HD" && hdiutil mount /Volumes/Recovery\ HD/com.apple.recovery.boot/BaseSystem.dmg. – Lri Apr 2 '12 at 13:51

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