Re: cat /dev/urandom

From: Gary W. Swearingen (garys_at_opusnet.com)
Date: 07/27/05

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    To: Michael Beattie <mtbeedee@gmail.com>
Date: Tue, 26 Jul 2005 18:03:43 -0700

    I don't use backticks, so this'll have the equivalent "$()".

    The command: cat /dev/urandom
    is passed to the shell and the shell executes "cat" and sends
    the output to the screen without possibility of executing anything
    (except the magic stuff recognized by your terminal emulator -- I hope
    it can't execute stuff).

    The command: $(cat /dev/random)
    is passed to the shell, where it does "command substitution" on
    it first and then executes it, where "it" is the output of the
    cat command, which could be destructive.

    Simpler tests are:

    pwd
    echo pwd
    $(echo pwd)
    echo $(echo pwd)

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