环境：Centos 7.6

#############################################################
# File Name: bj_int.sh
# Author: xunyin
# E-mail: lnhxzwb@126.com
# Created Time: Mon 08 Apr 2019 10:37:57 AM CST
# 比较两数大小
#==================================================================
#!/bin/bash
while true
do
read -p "int 1 :" A
read -p "int 2 :" B
if [ -z "`echo $A|sed 's/[1-9]//g'`" -a -z "`echo $B|sed 's/[0-9]//g'`" ];then 
if [ $A -gt $B ];then
echo "$A > $B"
elif [ $A -lt $B ];then
echo "$A < $B"
elif [ $A -eq $B ];then
echo "$A = $B"
fi
exit
else
if [ -z "`echo $A|sed 's/[1-9]//g'`" ];then
echo "$B 不是数字，请重新输入"
else
echo "$A 不是数字，请重新输入"
fi
fi
done
sleep 3