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Gnuplot for plotting graphs

This post shows you how to plot using gnuplot for producing/creating graphs. Usually these graphs are used to publish in papers like journals/conferences. Gnuplot tutorial on handling data files.
Gnuplot
Installation of gnuplot 
$] sudo apt install gnuplot
Two files for plotting a graph in gnuplot 
File1: mydata.txt  1 34.5 45 12000 2 36.4 34 24000 3 38.7 22 34000 4 32.3 18 43000 5 41.5 24 23456 6 35.6 36 12345 7 24.5 67 67987 8 56.7 54 45678 9 62.3 27 32123 10 65.4 33 8999
File2: mygnucode.plt
set terminal pdf
set output "pradeep.pdf"
set title "Drivers Data"
set xlabel "Number of Days"
set ylabel "Drivers Info"
plot "mydata.txt" using 1:2 with impulse title "Speed km/hr" lw 
2,"mydata.txt" using 1:3 with points title "Age" lw 2


set terminal png size 600,400
set output "salary.png"
set title "Drivers Data"
set xlabel "Number of Driver"
set ylabel "Drivers Salary"
plot "mydata.txt" usin…