All of the examples from the AMPL Book can be found on ampl.com

To run these examples with glpsol, you will need a command line like

glpsol -m prod.mod -d prod.dat

note that solve and display statements can be added to model file in GMPL. There is also printf in GMPL for more control over output. See Chapter 4 in the GNU MathProg Reference for more information. See also triangle for a simple example of using display.