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

How about using the system() command

set terminal png
set output "test.png"

# read shell input
# the echo prints the variable, which is then piped to gnuplot
fname = system("read filename; echo $filename")

plot for[col=2:4] fname using 1:col title columnheader(col) with lines 

You can call it now with

echo "data.txt" | gnuplot script.gp