This is a BASH script that uses the following variables:

LMPSEXEC:   Name of lammps executable
N:          Number of energy calculations to run
LATLO:      Initial lattice constant for simulation
STRIDE:     Increment to lattice constant for each iteration
OUTFILE:    Output file of lattice constant vs. total energy

This script uses the above variables to iteratively run N
lammps energy calculations from a lattice constant LATLO to 
LATLO + STRIDE*N as a maximum, while incrementing lattice 
constant by STRIDE for every calculation. The lattice constant
and energy are saved to the file OUTFILE in an X-Y fashion for
plotting to see the minimum energy lattice constant.

run using the following:
./example_07_loop.bash

or using:
bash example_07_loop.bash