[shell]shell脚本统计数值大小

#! /bin/bash

array=(1 ... 10000)
var1=0
var2=0

for((i=1;i<=10000;i++));
do
    array[i]="$( cat /sys/bus/iio/devices/iio:device0/in_voltage6_raw )"
    # echo ${array[i]}
    if [ "${array[i]}" -ge "0" ] 
    then
        if [ "${array[i]}" -le "20" ]
        then
            let var1=var1+1
        fi
    fi
    if [ "${array[i]}" -ge "3600" ]
    then
        if [ "${array[i]}" -le "3800" ]
        then
            let var2=var2+1 
        fi
    fi
    sleep 0.0001
done

echo $var1
echo $var2