htop command

How do I check swap (paging) usage under Linux operating systems using command bash/ksh line options?

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I am a new CentOS Linux user. How do I find out installed ram information on CentOS Linux? How do I find out memory usage statistics on Centos Linux version 5.x/6.x+ using console based command line option?

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I am a new Linux/CentOS/RHEL sysadmin. How do I install an interactive text-mode process viewer for called htop on CentOS or Red Hat Enterprise Linux 5.x/6.x+ based system using yum command?

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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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