GNUplot Tutorial for beginners (on Linux)

GNUplot is a versatile graphing and plotting tool which is more than sufficient for all your graphing needs. Some of the impressive features that I appreciate are:

• It provides great flexibility when you want a script to automate your graphing. I had to run several hundred simulations and plot the data for each and every one of them. Without GNUplot, i could not have done it.
• It can produce graphs in many different formats (both in vector and raster formats)
• It has nice curve-fitting tools
• It is free!

Here is a very simple tutorial for beginners that should get you started. If you are looking at something that has a more exhaustive coverage, you can check this: duke.edu GNUplot tutorial  or go to official GNUplot site for help.
So, lets get started.