> A careless sysadmin executes the following command: chmod 444 /bin/chmod - what do you do to fix this?

My favourite way of fixing it is by running /bin/chmod. It blows minds of most smart-asses who ask this question.

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Not sure what I'm missing here?

    $ docker run -it ubuntu
    # chmod 444 /bin/chmod
    # /bin/chmod
    bash: /bin/chmod: Permission denied