#!/usr/bin/gnuplot
# usage:
#   gnuplot -e "file='data.dat'; column1=1; column2=2; format='svg'; out='line.svg'" line.gp
#
# format = {'terminal', 'png', 'svg'}

if(!exists("file")) file = 'data.dat'
if(!exists("column1")) column1 = 1
if(!exists("column2")) column2 = 2
if(!exists("format")) format = 'terminal'
if(exist('format') && format eq 'terminal') set terminal dumb; set tics scale 0
if(exist('format') && format eq 'png') set terminal png transparent enhanced
if(exist('format') && format ne '') set terminal format
if(exists("out")) set output out

plot file u column1:column2 w l notitle