[lubuntu] How to Run a Command from Command prompt

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http://ubuntuforums.org – I see a 'Run' menu at the start menu at lubuntu desk top. Which can be activated by pressing Alt+F2. I want to do follwoing:Go To command prompt by Ctr+Alt+F2 Activate 'run' from command prompt Type xrandr -s 1 at the run command text box activate enter All these three step I want to do from Command prompt and not from Terminal. How is it possible? my objective is to set screen resolution from command prompt. (Hardware)