I did the following to change permissions:
su root //Now I know that was a bad move!
chmod 775 /bin
The plot thickens, though: I reformatted the computer, and logged in as root again (this was before I posted the question.) This time, I didn't edit anything (just
'd into the computer), and then logged out. Interestingly, I was locked out of both
. What should I do to correct this, short of rebooting the whole machine?