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I have 2 Mac OS X versions (10.5 and 10.6) installed on 2 different partition of my Mac. Is there a way that I can do from command line to reboot the system to switch to the other Mac OS X installation other than the current one?

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3 Answers

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See man 8 bless.

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up vote 2 down vote

You can choose the startup volume for your Mac by holding down the option key (a.k.a. alt) as it boots up.

This selection is just a temporary choice and does not change the default that your Mac will use.

For more info: http://support.apple.com/kb/HT1310

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if you read question he want do it in command line – Am1rr3zA Aug 26 '10 at 23:44
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$ bless --mount /Volumes/MacPartitionX --setBoot;sudo shutdown -r now

I think that or something similar will work for your purposes.

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