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vmstat command

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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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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How do I check the ram size from my Redhat Linux desktop system using command line and GUI tools? How do I find out memory size on Red Hat Enterprise Linux server?
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HowTo: Check Swap Usage In IBM Aix Unix

How do I check swap space usage (paging) under IBM AIX Unix operating system using command line options?
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HowTo: Check Swap Usage In Solaris Unix

Tutorial details
DifficultyEasy (rss)
Root privilegesYes
RequirementsNone
Estimated completion timeN/A

How do I check swap (page) usage under Sun / Oracle Solaris Unix operating systems using command line options? How do I see virtual memory statistics including used and total swap space?
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Find: Ram Size in Linux

How do I find out my RAM size under Linux operating systems?
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HowTo: Check RAM Size In Ubuntu Linux

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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