Advanced Bash−Scripting Guide

Advanced Bash−Scripting Guide
# let "generation += 1" # Increment generation count.
# Set variable to pass as parameter to "display" function.
avar=`echo ${array[@]}` # Convert array back to string variable.
display "$avar"
# Display it.
echo; echo
echo "Generation $generation −− $alive alive"
if [ "$alive" −eq 0 ]
then
echo
echo "Premature exit: no more cells alive!"
exit $NONE_ALIVE # No point in continuing
fi
#+ if no live cells.
}
# =========================================================
# main ()
# Load initial array with contents of startup file.
initial=( `cat "$startfile" | sed −e '/#/d' | tr −d '\n' |\
sed −e 's/\./\. /g' −e 's/_/_ /g'` )
# Delete lines containing '#' comment character.
# Remove linefeeds and insert space between elements.
clear
# Clear screen.
echo #
Title
echo "======================="
echo " $GENERATIONS generations"
echo "
of"
echo "\"Life in the Slow Lane\""
echo "======================="
# −−−−−−−− Display first generation. −−−−−−−−
Gen0=`echo ${initial[@]}`
display "$Gen0"
# Display only.
echo; echo
echo "Generation $generation −− $alive alive"
# −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
let "generation += 1"
echo
# Increment generation count.
# −−−−−−− Display second generation. −−−−−−−
Cur=`echo ${initial[@]}`
next_gen "$Cur"
# Update & display.
# −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
let "generation += 1"
# Increment generation count.
# −−−−−− Main loop for displaying subsequent generations −−−−−−
while [ "$generation" −le "$GENERATIONS" ]
do
Cur="$avar"
Appendix A. Contributed Scripts 384