GUI is a Graphical User Interface, which is for making "Windowed" Applications.
The CLI is a Command-Line Interface, which is a text prompt in which you can enter specific commands to be executed.
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If the operating system is linux open a terminal or ssh to the server and type: (as root) which php-cli or which php5-cli if nothing is ouputted it can't find it, then check if you've got it installed. Debian based distro's: apt-get install php5-cli hope this helps.
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