Use gunplot in terminal to plot a graph

using_gnuplot.sh

#For more info check : http://people.duke.edu/~hpgavin/gnuplot.html
#Install GnuPLot
brew install gnuplot 

#Before ploting a graph, set the terminal into dumb mode
set terminal dumb

#To Plot a graph
plot cos(x+2) #for a function
#for a data set
plot "./data.csv"

#To save the graph to a file , type the following commands into the terminal after you have plotted your graph

#Set terminal into png mode
set term png

#Set output file
set output "graph.png"

#Replot the graph
replot 

#Set the terminal back into dumb mode
set term dumb