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 [ $first -le 10-o$second -gt 20 ]
then
        echo "OK"
else
	echo "Not OK"
fi

#!/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