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Linux Performance Tools To Troubleshoot Problems

Q. I am new to Linux. What tools or commands are recommended to troubleshoot performance related problems?
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Linux Check Memory Usage

How do I check used and free RAM memory usage under Linux operating systems using command line and GUI tools?
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Server Uptime Command To Find Out How Long The System Has Been Running

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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