So far, I've been dual booting Mac OS X with Ubuntu.
Blessing the Ubuntu Partition will speed up the boot process. Apparently, all I have to do is this:
sudo bless –device /dev/disk0s3 –setboot –legacy –verbose
How can one reverse this command?
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"bless" is not a Ubuntu/Linux utility, so is not something we can help you with, probably you will get better help by asking in a Mac OS x support resource. I general if you don't understand how a command works you should not run it.