pipe plot data to gnuplot script

Question

I want to create a gnuplot with three plots in it. The data should be inline (as I want to only

It should look like this:

Answer 1

What's wrong with using the -e option of gnuplot from shell? You can provide a variable as input, say data.txt, from shell using:

gnuplot -e "filename='data.txt';ofilename='test.png'" plot.gnu

You should be able to call the above command multiple times with different values for "filename" from shell using a for loop.

And then you change your script plot.gnu to:

set terminal png
set output ofilename
plot for[col=2:4] filename using 1:col title columnheader(col) with lines