shell 函数返回值实现

now(){
    # echo `date +%Y:%m:%d %H:%M`
    send=`date '+%Y-%m-%d %H:%M:%S'`
    echo "${send}"
}

tmp=$(now)
tmpNew=`now`
echo "___$(now)___"
echo "___${tmp}___"
echo "___${tmpNew}___"

打印输出：
___2019-07-24 17:01:02___
___2019-07-24 17:01:02___
___2019-07-24 17:01:02___