How to see statistical information about how Linux is currently handling your memory,swap and processes?

Question: How to see statistical information about how Linux is currently handling your memory,swap and processes via the command line?

Answer: 

1. Open a new Terminal Window if not already in command line.
2. Type in the 'top' command.
3. Now a list of processes will appear as below.
   
   top - 09:38:39 up  1:09,  2 users,  load average: 0.43, 0.29, 0.29
   Tasks: 165 total,   2 running, 163 sleeping,   0 stopped,   0 zombie
   Cpu(s):  4.5%us,  3.2%sy,  0.0%ni, 92.2%id,  0.0%wa,  0.2%hi,  0.0%si,  0.0%st
   Mem:   1974152k total,  1622216k used,   351936k free,    68908k buffers
   Swap:  2493588k total,        0k used,  2493588k free,  1040980k cached
   
   PID    USER      PR  NI  VIRT   RES  SHR S   %CPU %MEM    TIME+  COMMAND 
   3652 root           20   0   412m  96m  51m S    9            5.0           9:05.48 Xorg 
4. There are a number of interactive controls with can be used together with the 'top' command, including Killing processes and changing the priorities of processes.
   • For example killing processes use the K key and then type in the process id which you wish to kill.
5. Type in the following command to find out more about the top command: man top

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