输入:1 -> 2
while read -a line; do
if (( line[2] < 1 )); then
echo "Graph does not match known sites3"
exit
fi
done < "$2"
错误
syntax error: invalid arithmetic operator (error token is "")
由于某种原因 line[2] 不被视为数字 2 ......我该如何解决这个问题?