How to check the Physical RAM and Swap Space in Unix/Linux Systems.

Following are the most required OS commands while installing and configuring Oracle Software on Unix/Linux Operating Systems.
Operating System: AIX 5L Based Systems (64-Bit)
Physical RAM: # /usr/sbin/lsattr -E -l sys0 -a realmem
Swap Space: # /usr/sbin/lsps -aOperating System: HP Tru64 UNIX
PPhysical RAM: # /bin/vmstat -P grep “Total Physical Memory”
Swap Space: # /sbin/swapon -s

Operating System: HP-UX Itanium
Physical RAM: # /usr/contrib/bin/machinfo grep -i Memory
Swap Space: # /usr/sbin/swapinfo -a

Operating System: HP-UX PA-RISC (64-Bit)
Physical RAM: # grep “Physical:” /var/adm/syslog/syslog.log
Swap Space: # /usr/sbin/swapinfo -a

Operating System: IBM zSeries Based Linux, LinuxItanium/POWER/x86/x86-64
Physical RAM: # grep MemTotal /proc/meminfo
Swap Space: # grep SwapTotal /proc/meminfo

Operating System: Solaris SPARC 64-Bit/x86/x86-64
Physical RAM: # /usr/sbin/prtconf grep “Memory size”
Swap Space: # /usr/sbin/swap -s