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sudo bless --folder /Volumes/yourdisk -label "Title here" bless is the command to set startup disk options. --folder specifies the disk and -label assigns it a label.


Here's a copy of /usr/bin/as from OS X 10.9.4. With regard to how you'd actually get it back, you might be able to extract it from the install media if you have it or by reinstalling the OS. See How can I get back a system file after deleting it from my Mac?


I have gotten this error when trying to delete or affect an invisible file before. Temporarily turning the file visible usually, in my experience, changes the error to a dialog that asks if you are sure you would like to change the file. I figure you have probably already come across this command, but for completeness, here is the explanation: To make ...

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