循环批处理文件似乎正在运行一次额外的时间/迭代 [英] Batch file for loop appears to be running one extra time/iteration

问题描述

我正在尝试将批处理文件放在一起，以在系统上除光驱之外的每个逻辑驱动器上运行程序.它可以很好地滤除光盘驱动器，但是由于某些原因，我正在测试的已建立命令的回显会额外运行一段时间，但变量没有值.就像循环在空值上迭代额外的时间一样.想法?

I'm trying to put a batch file together to run a program on each logical drive on a system except for optical drives. It filters out the optical drives just fine but for some reason my echo of the built up command I am testing with runs one extra time except the variables have no values. It's like the loop is iterating an extra time on a null value. Ideas?

(IF NOT！drive！==％safe％只是确保我不为脚本所在的驱动器运行命令，而"safe"只是首字母缩写)

(The IF NOT !drive! == %safe% is just making sure I don't run the command for the drive the script lives on and "safe" is just an acronym)

for /F "usebackq skip=1 tokens=1,2" %%a IN (`wmic logicaldisk get DeviceID^,DriveType`) do (
    SET drive=%%a
    SET driveType=%%b
    IF NOT !drive! == %safe% (
        IF NOT !driveType! == 5 (
        ECHO test commands
        )
    )
)

推荐答案

wmic在其结果报告的末尾附加一个回车符.尝试这样的事情:

wmic puts an additional carriage return at the end of its resulting report. Try something like this:

for /f "skip=1 tokens=1,2" %%a IN ('wmic logicaldisk get DeviceID^,DriveType ^| findstr /v /r /c:"^$"') do (
    SET drive=%%a
    SET driveType=%%b
    IF NOT !drive! == %safe% (
        IF NOT !driveType! == 5 (
            ECHO test commands
        )
    )
)

注意:由于您的命令不包含正向滴答声，因此不需要usebackq.此处的findstr只是搜索空白行(即，正则表达式是行的开头，然后是行的末尾").

Note: usebackq isn't required since your command doesn't include forward-ticks. The findstr there just searches for a blank line (that is, the regex is "beginning of line followed by end of line").

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