#+begin_src sh
  usage:
    gnuplot line.gp                       run line.gp script
    gnuplot -p line.gp                    run script and kepp figure open
    gnuplot -e "file='data.dat'; column1=1; column2=2; fformat='svg'; out='line.svg'" line.gp
                                          run script with altered variables
#+end_src

[[file:./line.gp][line.gp]]

file:./line.png