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#!/bin/sh
#
# See ../README.md
#
#
# Run as: bash ch-2.sh < input-file
#
set -f
w=(1 3 1 7 3 9 1)
printf -v ord_0 %d "'0"
printf -v ord_A %d "'A"
while read line
do if ((${#line} != 7))
then echo 0
elif [[ $line =~ [^0-9BCDFGHJKLMNPQRSTVWXYZ] ]]
then echo 0
elif [[ $line =~ [^0-9]$ ]]
then echo 0
else
((check = 0))
for ((i = 0; i < 7; i ++))
do char=${line:$i:1}
printf -v ord %d "'$char"
if [[ $char =~ [0-9] ]]
then ((value = ord - ord_0))
else ((value = ord - ord_A))
fi
((check += ${w[i]} * value))
done
if ((check % 10 == 0))
then echo 1
else echo 0
fi
fi
done
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