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#!/bin/sh
validate_input() {
invalid=0
regex='^[0-9]+$'
for i in "$@"; do
if ! [[ $i =~ $regex ]]; then
echo "error: \"$i\" is not a number" >&2
invalid=1
fi
done
if [ $invalid -eq 1 ]; then
exit 1
fi
}
print_results() {
sum=0
printf "squares:"
for i in "$@"; do
sum=$((sum + $i))
printf " $(($i * $i))"
done
printf "\n"
echo "sum: $sum"
}
validate_input $@
print_results $@
exit 0
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