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Comment by kngspook | Hacker News Reader

I can't speak to El Capitan, but no Apple software has dropped anything in /usr/local that I've found in the last 3+ releases. I'm very confident El Capitan would continue that history.

A lot of other apps do put stuff there though (when I wish they'd keep it in their own bundle).

Even worse, a lot of other apps drop stuff into /usr/bin.

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They can no longer drop stuff in /usr/bin as of El Capitan, though.

You can't even do it with root:

    [mason@IT-PC-MACPRO ~]$ sudo bash
    Password:
    [root@IT-PC-MACPRO ~]# touch /usr/bin/nope
    touch: /usr/bin/nope: Operation not permitted
    [root@IT-PC-MACPRO ~]# cat 'nope nope' >> /usr/bin/nope
    bash: /usr/bin/nope: Operation not permitted

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