/ /设置str = % myvar#: * = % / /这个替换所有“:” " "                                                         //findstr "子网掩码" my_log.txt > my_find.txt//在文件中搜索“字符串”并保存到新文件中 //“>”重制文件，如果使用“>>”添加在旧文件// im建议使用“>”

@echo off
 
ipconfig > my_log.txt
findstr "Subnet Mask" my_log.txt > my_find.txt 
set /p myVar= < my_find.txt 
echo %myVar%

set str=%myVar:*:=%
set str=%str:.= im_dot %
echo %str%

pause

作为前面答案的补充，管道可以在for语句中使用，由插入符号转义:

    for /f "tokens=*" %%i in ('tasklist ^| grep "explorer"') do set VAR=%%i

我写了脚本，每5秒ping google.com，并记录当前时间的结果。在这里你可以找到变量“commandLineStr”的输出(带索引)

@echo off

:LOOPSTART

echo %DATE:~0% %TIME:~0,8% >> Pingtest.log

SETLOCAL ENABLEDELAYEDEXPANSION
SET scriptCount=1
FOR /F "tokens=* USEBACKQ" %%F IN (`ping google.com -n 1`) DO (
  SET commandLineStr!scriptCount!=%%F
  SET /a scriptCount=!scriptCount!+1
)
@ECHO %commandLineStr1% >> PingTest.log
@ECHO %commandLineStr2% >> PingTest.log
ENDLOCAL

timeout 5 > nul

GOTO LOOPSTART

/ /设置str = % myvar#: * = % / /这个替换所有“:” " "                                                         //findstr "子网掩码" my_log.txt > my_find.txt//在文件中搜索“字符串”并保存到新文件中 //“>”重制文件，如果使用“>>”添加在旧文件// im建议使用“>”

@echo off
 
ipconfig > my_log.txt
findstr "Subnet Mask" my_log.txt > my_find.txt 
set /p myVar= < my_find.txt 
echo %myVar%

set str=%myVar:*:=%
set str=%str:.= im_dot %
echo %str%

pause

@echo off
SETLOCAL ENABLEDELAYEDEXPANSION

REM Prefer backtick usage for command output reading:
REM ENABLEDELAYEDEXPANSION is required for actualized
REM  outer variables within for's scope;
REM within for's scope, access to modified 
REM outer variable is done via !...! syntax.

SET CHP=C:\Windows\System32\chcp.com

FOR /F "usebackq tokens=1,2,3" %%i IN (`%CHP%`) DO (
    IF "%%i" == "Aktive" IF "%%j" == "Codepage:" (
        SET SELCP=%%k
        SET SELCP=!SELCP:~0,-1!
    )
)
echo actual codepage [%SELCP%]

ENDLOCAL

一种方法是:

application arg0 arg1 > temp.txt
set /p VAR=<temp.txt

另一个原因是:

for /f %%i in ('application arg0 arg1') do set VAR=%%i

请注意，%%i中的第一个%用于转义后面的%，并且在批处理文件中而不是在命令行中使用上述代码时需要它。想象一下，你的test.bat有这样的东西:

for /f %%i in ('c:\cygwin64\bin\date.exe +"%%Y%%m%%d%%H%%M%%S"') do set datetime=%%i
echo %datetime%