“&"是什么意思?在这个批处理文件中做什么? [英] What does "&&" do in this batch file?

问题描述

我从回答我一个问题的人那里收到了一行代码，但我很困惑:&&"是什么意思在这个批处理文件中做.

I received a line of code from someone who answered one of my questions, but I am confused: what do the "&&" do in this batch file.

@echo off
set /p Quest="How are you today? "
echo %Quest% > Results.txt
findstr /r /i "not.*good not.*well" Results.txt >nul && echo Sorry && goto pause
findstr /i "good well" Results.txt >nul && echo My day is doing good as well
:pause
pause

推荐答案

&& 当第一个命令成功返回时(即 errorlevel ==0).&& 的反义词是 ||，它在第一个命令不成功时运行第二个命令(即 errorlevel != 0).

&& runs the second command on the line when the first command comes back successfully (i.e. errorlevel == 0). The opposite of && is ||, which runs the second command when the first command is unsuccessful (i.e. errorlevel != 0).

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