Chapter 7Backups

THERE ARE SO MANY ENEMIES of your data. When it comes to disks, it’s not a question of whether your hard drives will fail, it’s a question of when. Beyond hard drive failure you find rm, dd, and a number of other Linux commands that are incredibly efficient at destroying your data. Just ask a good friend of mine who was trying to clean up his MP3 directory. A number of us were helping him perfect a find script that would delete all of the files in his MP3 directory that did not end in .mp3. Despite our warnings to test the script with echo first, he ran the full command: find . -type f ! -name ′*.mp3′ -exec rm -f {} \;. At first it appeared to be working, until he discovered he hadn’t run the command in his MP3 directory—he ran ...

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