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What is the best way to change drives through command line on a mac?

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What do you mean by change drives?

If you mean changing directory so that you can use the files on an external drive, they're mounted in /Volumes, so if you wanted to work in the root of a disk called Foo, you'd go cd /Volumes/Foo.

If you mean ejecting a drive so you can unplug it, hdiutil unmount /Volumes/[drive name] is what you want, so to unmount a disk called Foo, you'd go hdiutil unmount /Volumes/Foo.

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There is no such thing as drive letters, one working directory per drive and the need to type e.g. C: on Mac OS X, as there is on Windows. – Daniel Beck Jan 24 '11 at 10:35
I'm not sure where you got the idea that I was talking about drive letters - hopefully things are clearer now. – Scott Jan 24 '11 at 10:42
Sorry, meant that as an addition, as I suspect this concept caused the user's confusion (but your edit is useful anyway). If you reply to comments, please use @-syntax, e.g. @DanielBeck or @Daniel, so the user you reply to gets a notification. – Daniel Beck Jan 24 '11 at 10:45
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up vote 3 down vote

You don't; you just go to another mounted volume.

cd /Volumes/"Some Volume Name Here"
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