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    shell is a program that interacts directly with an operating system such as MS-DOS, Unix/LinuxMac OS X, or others — but it is most commonly associated with Unices. It is often referred to as a ‘console’ or ‘command line’, because it is controlled using typed commands rather than a mouse or graphical interface input.

    Most often, when interacting with a remote computer (as one would when configuring WordPress), an additional “faux” shell is involved called SSH.

    Some popular shell programs are:

    • Bash (Bourne Again Shell)
    • Tcsh (an expanded C Shell)
    • Zsh