Explanation of CLI:

CLI stands for Command Level Interface. CLI tools are programs that you execute using a command line (as opposed to a GUI).

If you're a Linux or UNIX user, CLI is more or less the same thing as “shell level”.

If you're an MS-Windows “power user” or a long-time sysadmin, you're probably familiar with CLI tools. If you've never heard of CLI, and you primarily run MS-Office®, etc., CLI will involve a learning curve.

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