Monitor System and System Utilities

Dump the output of a file to your screen but allows no scrolling just a dump.
cat 

Check interrupts
cat /proc/interrupts

Check memory 
cat /proc/meminfo

Clear screen
clear

Display or sets date and time
date 

Check disk space available and used:
df

Partition hard drives
fdisk device

File system check and repair
Fsck

Check Network Adapter configuration
ifconfig

List Loaded Modules such as disk drivers
lsmod 

Display  information on pci buses and hardware devices attached to them
lspci

Make Linux Boot disk – 
Make Linux Boot disk - mkbootdisk --device /dev/fd0 'uname -r'

Display the current processes that are running and there process id or number.
ps 

Display processes running that begin with vmware:
ps aux | grep vmware

Check Kernel version:
ver-uname -r 

Display one-line summary of specified command
whatis 

Display who is logged on the system.
who 

Display information about userid that is currently logged in
whoami

top
This program shows a lot of stuff that goes on with your system. In the program, you can type:
1. M for memory usage information 
2. P for CPU information 
3. q to quit 
Once you try it, you can see that top shows you the memory usage, uptime, load average, CPU states, and processes.

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