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atop command

CentOS / RHEL: Install atop (Advanced System & Process Monitor) Utility

I do not like top. How do I install Advanced System & Process Monitor tool called atop on CentOS or Red Hat Enterprise Linux 5.x/6.x+ based system using yum command?
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HowTo: Check Swap Usage in Linux

How do I check swap (paging) usage under Linux operating systems using command bash/ksh line options?
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CentOS Linux: Find Memory (RAM) Usage Information Command

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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