将变量设置为命令值 [英] Set Variable to value of command

问题描述

我需要将WMIC COMPUTERSYSTEM GET MODEL/Value的值设置为变量.当我运行此命令时，我得到以下结果.为什么我会得到多余的空白行?

I need to set the value of WMIC COMPUTERSYSTEM GET MODEL /Value to a variable. when I run this command I get the results below. Why do I get the extra blank lines?

U:\>for /f "delims=" %i in ('WMIC COMPUTERSYSTEM GET MODEL /Value') do set output=%i
 :\>set output=
 :\>set output=
 :\>set output=Model=HP ProDesk 600 G1 SFF
 :\>set output=
 :\>set output=
 :\>set output=

推荐答案

这是WMIC输出的问题，其中包含carriage return个字符.
因此，空行不会被删除，因为它们并不完全是空的.

It's a problem of the WMIC output, that contains carriage return characters.
Therefore the empty lines aren't removed, as they are not completely empty.

回车符还负责:>而不是U:>的奇怪输出，因为回车符首先将光标移动到POS1，然后空格删除U.

The carriage returns are also responsible for the strange output of :> instead of U:>, as the carriage return first moves the cursor to POS1 and then a space deletes the U.

使用额外的FOR/F，您可以删除回车符

With an extra FOR/F you can strip the carriage return characters

for /f "delims=" %i in ('WMIC COMPUTERSYSTEM GET MODEL /Value') do @(
    for /F "delims=" %X in ("%i") do set output=%X
)

顺便说一句.通常，您希望在批处理文件中而不是在命令行中使用这样的表达式.
然后，您必须将其转换为

Btw. Normally you want such an expression in a batch file, not at the command line.
Then you have to convert it to

@echo off
for /f "delims=" %%i in ('WMIC COMPUTERSYSTEM GET MODEL /Value') do (
    for /F "delims=" %%X in ("%%i") do set output=%%X
)

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