Mac OS 终端脚本文件变量 (.command)

Question

I'm fairly new to writing scripts on Mac OS so apologies if the answer is fairly obvious.

I want to add a date variable to my script on Mac OS that will output the current date in YYYYMMDD format.

On Windows I would write this as:

set now=%date:~6,4%%date:~3,2%%date:~0,2%
%now%

How would I do something similar when writing a.command file on Mac OS?

Answer 1

You can run this in a terminal/bash script

myDate=$(date +%F) 
echo $myDate

It outputs a date like:

2021-05-21

Alternatively you can specify a formatter:

myDate=$(date +%Y%m%d) # to remove the dashes

Answer 2

Starting in bash 4.1 or 4.2, the builtin printf can emit the formatted time:

printf '%(%Y%m%d)T' -1      # => 20210521

Since MacOS ships with bash 3.2 by default that means you'll need to install a newer version yourself. With Homebrew that is as easy as brew install bash