字符串进行运算以及进行for循环

#!/bin/bash

server_num=$(ps aux | grep 110[0-9] | awk -F "\"" '{print $4}' | sort | tail -n 1 | cut -c 4)

#bb=`echo "$server_num + 5" | bc`

bb=`expr $server_num + 5`

#echo $bb

for((i=0;i<=$bb;i++))

do

        echo $i

done