在变量中使用> nul [英] Using >nul in a variable

问题描述

有没有人知道如何在变量中设置时忽略> nul ，或者这是不可能的？我有一个感觉，这是只有当所有的变量已经扩展或某事，但它不会伤害要求的工作之一。

示例：

  @echo off 
 
 ::无效
 SET pause_5 = ping localhost / n 6> nul 
％pause_5％
 
 :: will work 
 SET pause_5 = ping localhost / n 6 
％pause_5％> nul 
 
 exit 
  

解决方案

 设定「pause_5 = ping localhost / n 6> nul」
  pre> 
 
 
另一个选项是转义将被shell解释的字符：
  set pause_5 = ping localhost / n 6 ^> nul 
  
 
 
 
 
你写的方式本质上说»set  pause_5 到 ping localhost / n 6 并忽略 set 命令的输出。«
 
Does anyone know how to stop >nul being ignored when set in a variable, or is this not possible? I have a feeling that it's one of those things that will only work once all variables have been expanded or something, but it can't hurt to ask.

Example:
@echo off

:: Won't work
SET pause_5=ping localhost /n 6 >nul
%pause_5%

:: Will work
SET pause_5=ping localhost /n 6
%pause_5% >nul

exit

解决方案
Put quotes around the argument:
set "pause_5=ping localhost /n 6 >nul"
Another option is to escape characters that will be interpreted by the shell:
set pause_5=ping localhost /n 6 ^>nul
But usually the quotes approach is a lot easier.

The way you wrote is essentially said »set pause_5 to ping localhost /n 6 and ignore the output of the set command.«.

                        
这篇关于在变量中使用> nul的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！