The Unix roots of Apple’s OS X means the operating system offers a range of performance and troubleshooting features every Mac user should get to know.

Many of these tools require use of the Terminal app. This is a command line app that offers deep access to your operating system. You don’t have to be an expert to use these Terminal tips, but it is essential you only use commands in the forms listed here to avoid accidentally damaging your machine.

Introducing fsck

I can’t praise fsck highly enough. These four letters have saved many a Mac, helping me bring the computer back to life when all else failed. On several occasions I have been able to use this command to launch an ailing Mac for just long enough to back drive contents up before the drive or other hardware problems finally prevail. It’s incredibly useful.

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