shell条件语句

#!/bin/bash
#auto if test

NUM=100

NUM1=200

if (($NUM>$NUM1));then
        echo "this $NUM greate $NUM1 "
else
        echo   "this  $NUM  XIAOU $NUM1

root@yisheng-v-m:/home/yisheng/shell# /bin/bash -n 5.sh
root@yisheng-v-m:/home/yisheng/shell# 

#!/bin/bash
#by hou 2019

DIR=/tmp/2019

if [ ! -d $DIR ];then
        mkdir -p $DIR
        echo -e "\033[32mthis $DIR create success!\033[0m"
else
        echo -e "\033[32mthis $DIR exit!\033[0m"
fi