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How do I check amount of RAM in my Ubuntu Linux laptop or desktop system/server using GUI and command line tools?

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How do I see all running process in Linux operating systems using command line or GUI options?

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How do I check used and free RAM memory usage under Linux operating systems using command line and GUI tools?

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I’d like to find out how long the system has been running under UNIX or Linux operating system. How do I find out system uptime?

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