Plot from terminal

.sh

#!/bin/bash
# This i script shows an example about how to plot data directly copy/paste in the terminal. 
# Example of execution:
# ./script.sh
# 1 2 3
# 2 3 4
# CTRL-D
# Then a graph will pop up

input=`cat`

echo "set terminal x11 persist

\$data <<EOD
$input
EOD

plot '\$data' u 1:2 with lines, \
      '' u 1:3 with points" | gnuplot -p