windows 如何从批处理文件中检查文件是否存在
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/4340350/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How to check if a file exists from inside a batch file
提问by sab
I need to run a utility only if a certain file exists. How do I do this in Windows batch?
仅当某个文件存在时，我才需要运行实用程序。如何在 Windows 批处理中执行此操作？
回答by Chris J
if exist <insert file name here> (
rem file exists
) else (
rem file doesn't exist
)
Or on a single line (if only a single action needs to occur):
或者在一行上（如果只需要执行一个操作）：
if exist <insert file name here> <action>
for example, this opens notepad on autoexec.bat, if the file exists:
例如，如果文件存在，这将在 autoexec.bat 上打开记事本：
if exist c:\autoexec.bat notepad c:\autoexec.bat
回答by u109919
C:\>help if
Performs conditional processing in batch programs.
在批处理程序中执行条件处理。
IF [NOT] ERRORLEVEL number command
IF [NOT] string1==string2 command
IF [NOT] EXIST filename command
IF [NOT] ERRORLEVEL 数字命令
IF [NOT] string1==string2 命令
IF [NOT] EXIST 文件名命令
回答by RBerteig
Try something like the following example, quoted from the output of IF /?on Windows XP:
尝试类似以下示例，引用自IF /?Windows XP 上的输出：
IF EXIST filename. (
del filename.
) ELSE (
echo filename. missing.
)
You can also check for a missing file with IF NOT EXIST.
您还可以使用IF NOT EXIST.
The IFcommand is quite powerful. The output of IF /?will reward careful reading. For that matter, try the /?option on many of the other built-in commands for lots of hidden gems.
该IF命令非常强大。的输出IF /?将奖励仔细阅读。就此而言，请尝试/?许多其他内置命令的选项，以获取许多隐藏的宝石。
