plot [:] [0:18] './average2' using 1:5 with lines, './average2' using 1:3 with lines

Here documents:

gnuplot <<END
> plot [:] [0:18] './average2' using 1:5 with lines, './average2' using 1:3 with lines
> END

Saving graphs

set terminal postscript

set output "test.ps"

plot [:] [0:18] './average2' using 1:5 with lines, './average2' using 1:3 with lines

quit

output gets saved to a ps file

-- AmitaEkbote - 16 Jul 2009