====== 折れ線グラフ ======
  $ sh mkgraph.sh

適時filenameを置き換えて上記のように実行してください。

<file .sh mkgraph.sh>
gnuplot <<EOF
filename = "sample.csv"
set datafile separator ","
set xlabel "label x"
set ylabel "label y"
set tics font "Arial, 12"
set terminal pngcairo
set output "sample.png"
plot [] [] filename title "name of data" with lines
#EOF
</file>