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>> Most distros symlink /bin to /usr/bin.
> Uhm, no? I've only seen it in recent CentOS (older versions didn't have it), and maybe Fedora does this as well.
Arch, Ubuntu, Debian all do it.

I haven't checked Arch, but neither Ubuntu 16.04 nor Debian Jessie haven't created /bin as a symlink.

> You can do it [restoring execution bit on /bin/chmod] in any number of ways [...]
Only the last one is a clever solution

On interview you don't need to have the most clever answer. It's better to show you understand the mechanisms underneath by having several sensible ways.

What do you mean? They didn't know there's a copy of the same binary?

No, I meant this: https://news.ycombinator.com/item?id=11627670

And there is no copy of the same binary.

I haven't checked Arch, but neither Ubuntu 16.04 nor Debian Jessie haven't created /bin as a symlink.

Odd, I could've sworn they did. I stand corrected.

> What do you mean? They didn't know there's a copy of the same binary?
No, I meant this: https://news.ycombinator.com/item?id=11627670
And there is no copy of the same binary.

That's what I said, you use the ELF interpreter. :P

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