如何在shell脚本中使用逻辑或&和

#!/bin/bash

read -p "Enter First Numeric Value: "   first

read -p "Enter Second Numeric Value: "  second

if [ $first -le 10-a$second -gt 20 ]

then

        echo "OK"

else

    echo "Not OK"

fi

#!/bin/bash

read -p "Enter Your Number:"  i

if [ ( $i -ge 10  -a  $i -le 20 ) -o ( $i -ge 100  -a  $i -le 200 ) ]

then

        echo "OK"

else

    echo "Not OK"

fi