#vmstat (summary information for system load and usage, but does not show individual processes)

#ps aux (display all processes running on the Linux system)(to search for specific processes or list them all)

#ps aux | grep auth (all the processes that have auth in them)

#ps auxf | sort -nr -k 4 | head -10 (shows the top 10 memory consuming processes)

#cat /proc/cpuinfo (lot of information about the system and the hardware associated)

#cat /proc/meminfo (information on memory and memory usage)

#cat /proc/mounts (various file systems and where they are mounted and which options have been used)

#df -h (Show a summary of disk usage and some useful key combinations Keyboard Combinations SHIFT + PAGE UP scroll up the screen CTRL + C stop a running command eg ping)