windows 批处理文件 - 使用变量
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batch file - use of variable
提问by Joey
@echo off
set filename =
cd GWConfig_TDS-mtpe3003
set filename = VCU17_CCU6\applications\VCU17APP
GOTO CHECKFILE
:CHECKFILE
echo reached
IF EXIST %filename% ( echo exists
) ELSE ( echo Doesnot exist )
/////////////////////////////////////////////////
/////////////////////////////////////////////////
Here output shows :
这里的输出显示：
reached
Doesnot echo "exists" or "Doesnot exist"
不回显“存在”或“不存在”
Is there anything wrong with the use of variable "filename".
使用变量“文件名”有什么问题吗？
Also,
还，
@echo off
set filename =
cd GWConfig_TDS-mtpe3003
set filename = VCU17_CCU6\applications\VCU17APP
GOTO CHECKFILE
:CHECKFILE
echo reached
IF EXIST VCU17_CCU6\applications\VCU17APP ( echo exists
) ELSE ( echo Doesnot exist )
gives output:
给出输出：
reached
exists.
回答by Jon Skeet
There are two problems here. One is the space after the variable name:
这里有两个问题。一种是变量名后的空格：
SET filename = whatever
should be
应该
SET filename=whatever
(Or you could use %filename %later, but that's just horrible :)
（或者你可以%filename %稍后使用，但这太可怕了:)
The second problem is that without any quotes, your "IF" test won't work properly if %filename%is empty. Quote it instead:
第二个问题是，如果没有任何引号，您的“IF”测试如果%filename%为空将无法正常工作。改为引用它：
IF EXIST "%filename%" ( echo exists
) ELSE ( echo Doesnot exist )
回答by Joey
I don't have the time to properly re-create this now, but I can spot a few potential problems:
我现在没有时间正确地重新创建它，但我可以发现一些潜在的问题：
Have you tried removing the spaces around the
=inset:set filename=VCU17_CCU6\applications\VCU17APPotherwise you might have a single space leading your file name
You might want to try to quote the use of
%filename%:IF EXIST "%filename%" ( ...
您是否尝试过删除
=in周围的空格set：set filename=VCU17_CCU6\applications\VCU17APP否则你的文件名前可能会有一个空格
您可能想尝试引用以下用法
%filename%：IF EXIST "%filename%" ( ...
