This is designed to be a stand-alone Terminal Emulator useful when you don't have ssh access. It is limited to the permissions of the user PHP is set up to run commands under, generally _www.
Drop this file in the desired directory and have at it.
These are the built in commands:
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clear -- Clears all previous commands and responses. Acts as if you just logged in.
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logout -- Clears the session and re-enables the password protection.