shell script练习

#!/bin/bash
echo -e "I will use ‘touch‘ command to create 3 files."
read -p "Please input your filename:" fileuser

filename=${fileuser:-"filename"}

echo $filename

date1=$(date -d ‘-2 day‘ +%Y%m%d) #前两天的日期
date2=$(date -d ‘-1 day‘ +%Y%m%d) #前一天的日期
date3=$(date "+%Y%m%d")           #下面三行在配置文件名
file1=${filename}${date1}
file2=${filename}${date2}
file3=${filename}${date3}

touch "$file1"
touch "$file2"
touch "$file3"