Kind of a CHESS board block here.
#!/bin/sh
for m in `seq 8` ### Outer for loop ###
do
for n in `seq 8` ### Inner for loop ###
do
T=`expr $m + $n`
S=`expr $T % 2`
if [ $S -eq 0 ]; then
echo -e -n "\033[47m " ### white ###
else
echo -e -n "\033[40m " ### black ###
fi
done
echo -e -n "\033[40m" #### background colour=black ###
echo "" #### printing new line ###
done
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