I typed the following command, and now
bash isn't working.
$ sudo chmod a-x /bin/bash_old /bin/sh_old
It just says:
login: /bin/bash: No such file or directory.
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Hmm... I suspect that you typed some other commands that actually caused this error. Did you do an
mv /bin/bash /bin/bash_old or a
cp followed by
rm /bin/bash? Because it now looks like you don't have a
/bin/bash on your system and that
/bin/bash is set as your login shell in
/etc/passwd. I would move the shells back to where they were to fix the problems.
I should point out that this is sort of a strange problem to run into. Perhaps you want to post a new question on this site that states what you're trying to do and asks for help at doing it.