问题描述
我试图创建2以下确定指标的用户环境变量：
I'm trying to create 2 user environment variables with the following defintion:
datel=%date:~-4%%date:~3,2%%date:~0,2%
datetime=%date:~-4%%date:~3,2%%date:~0,2%-%time:~0,2%_%time:~3,2%_%time:~6,2%
这样每次我打电话：
so that every time I call:
echo %datel%
echo %datetime%
我得到：
20110407
20110407-11_45_45
我可以定义用户环境变量没有在GUI中的问题（电脑 - >（右键）属性 - >高级系统设置 - >环境变量），当我做了一个新的cmd窗口，我得到了套以下内容：
I can define the user environment variables without problems in the GUI (Computer->(Right Click)Properties->Advanced System Settings->Environment Variables) and when I do a "set" in a new cmd window I get the following:
>set da
datel=%date:~-4%%date:~3,2%%date:~0,2%
datetime=%date:~-4%%date:~3,2%%date:~0,2%-%time:~0,2%_%time:~3,2%_%time:~6,2%
但随后呼应他们是不是我所期待的：
But then "echoing" them is not what I expected:
C:\Users\jaravj
>echo %datel%
%date:~-4%%date:~3,2%%date:~0,2%
C:\Users\jaravj
>echo %datetime%
%date:~-4%%date:~3,2%%date:~0,2%-%time:~0,2%_%time:~3,2%_%time:~6,2%
由于一个巨大的很多提前。
Thanks a huge lot in advance.
推荐答案
或者使用延迟扩展，那么你就能够用一行扩大两倍。
Or use the delayed expansion, then you are able to expands two times in one line.
setlocal
set "datel=!date:~-4!!date:~3,2!!date:~0,2!"
setlocal EnableDelayedExpansion
echo %datel%
它的作品，因为，第一批次行分析器扩张 DATEL％％到日期：〜-4 !!日期：3,2〜 ！日期：〜！0,2 毕竟％的扩张完成。
It's works because, first the batch line parser expands %datel% to !date:~-4!!date:~3,2!!date:~0,2! and after all percent expansions are done.
然后，转义字符进行处理，然后作为最后阶段解析器扩展感叹词被扩展。
Then the escape characters are handled, and then as the last phase the parser expands the exclamations are expanded.
在<一个解释href=\"http://stackoverflow.com/questions/4094699/how-does-the-windows-command-inter$p$pter-cmd-exe-parse-scripts/4095133#4095133\">how CMD.EXE解析脚本
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