Create a text file with the following contents:
0 0 0
1 1 1
2 4 8
3 9 27
4 16 64
and call the file powers. Plot the first column vs. the second by:
plt powers 0 1 -t "Squares of small integers" -x "Integer" -y "Square"
The same file can be used to generate a number of different plots, by choosing different columns. To plot the third column vs. the first, try:
plt powers 2 0 -t "Marshmallows" -x "Mass (kg)" -y "Height (m)"