linux - 第 8 行 : [: N: integer expression expected

Question

我收到错误第 8 行:[:N:需要整数表达式。我尝试删除 $userManuf 中的 "" 并将 = 更改为 ==，但仍然收到错误。我应该怎么办？谢谢

function manuf {
 echo -n "Manufacturer: " ; read userManuf
 varManuf=$(mysql -D snipeit -e "SELECT count(id) FROM manufacturers;")
 countManuf=$(echo $varManuf | awk '{print $2}')

 if [ $userManuf -ne 0 ] && [ $userManuf -le $countManuf ]; then
    assetModelManuf=$userManuf
 elif [ "$userManuf" = "n" ] || [ "$userManuf" = "N" ]; then
    echo -n "Type new manufacturer name: " ; read userNewManuf
    assetModelManuf=$userNewManuf
 else    echo "Try again!" && manuf
 fi
}

Answer 1

当$userManuf扩展为N，但您尝试将其用作整数运算符-ne的操作数时，就会发生错误。最简单的修复方法是首先验证它是否具有数值(然后使用算术语句来简化比较):

if [[ $userManuf =~ [0-9]+ ]] && (( 0 < userManuf && userManuf <= countManuf )); then
    assetModelManuf=$userManuf
elif [[ $userManuf = [nN] ]]; then
    read -p "Type new manufacturer name: " assetModelManuf
else
    echo "Try again!" && manuf
fi

您可能还想使用 while 循环而不是递归调用 manuf。我将把它作为练习(或将来的问题，如果需要的话)。