OS Commands to find Swap, RAM, and OS Version

AIX 

Swap:          /usr/sbin/lsps -a
RAM:           /usr/sbin/lsattr -HE -l sys0 -a realmem
OS version:    oslevel

HP PA-RISC

Swap:          swapinfo -a
RAM:           grep "Physical:" /var/adm/syslog/syslog.log
OS version:    uname -a


Solaris

Swap:          swap -l
RAM:           /usr/sbin/prtconf | grep -i memory
OS version:    uname -r

Linux

Swap:          free
RAM:           free
OS version:    uname -a

Mac OS X

Swap:          # df -h /
RAM:           # /usr/sbin/system_profiler SPHardwareDataType | grep Memory
OS version:    # sw_vers