/bin/sh not responding...causing total breakage

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http://crunchbanglinux.org – I've had #! on my work MacBook for about a week.  For some reason, today, it's decided to go haywire on me. I can't start the terminal. By "the terminal" I mean *any* terminal. In recovery mode, I switched the default from terminator to gnome-terminal, but that too freezes. I once got Terminator to let me know that /bin/sh was not responding. After that, I had to hard reboot the system (holding the power button), as it became 100% unresponsive.Everything was working fine before I left work yesterday, and was working for a couple of hours this morning. All I'v (HowTos)