Bash Pipe Multiple Lines into Gnuplot

Question

I have the code,

echo "set term postscript" |
echo "set output 'output.ps'" |
for FILE in output*; do
    echo "plot '${FILE}' u 1:2 w l t '1', '${FILE}' u 1:3 w l t '2', '${FILE}' u 1:4 w l t '3'"
done | gnuplot -persist

I want the first two lines to be printed before anything else inside gnuplot. How can I achieve this?

Best,

Jacob

ruakh · Accepted Answer · 2013-11-28 21:18:50Z

2

Do I understand correctly that you are trying to "group" the first three commands and pipe their collective output into gnuplot? If so, you can write:

{
  echo "set term postscript"
  echo "set output 'output.ps'"
  for FILE in output* ; do
    echo "plot '${FILE}' u 1:2 w l t '1', '${FILE}' u 1:3 w l t '2', '${FILE}' u 1:4 w l t '3'"
  done
} | gnuplot -persist

Edited to add: Incidentally, you might find it more readable to break up your third echo across multiple lines:

    echo plot "'${FILE}' u 1:2 w l t '1'," \
              "'${FILE}' u 1:3 w l t '2'," \
              "'${FILE}' u 1:4 w l t '3'"

(echo joins its arguments with spaces, so this is equivalent to the previous. It's totally up to you which version you find easier to work with.)

edited Nov 28, 2013 at 21:18

answered Nov 28, 2013 at 19:43

ruakh

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