Windows bat 脚本：如何判断文件是否存在？
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Windows bat script: how to judge if a file exists?
提问by Bin Chen
Pseudo code:
伪代码：
if file exists:
do
xxxx
done
else:
do
xxxx
done
回答by Mark Wilkins
You can use exist:
您可以使用exist：
if exist somefile.dat echo It exists
Depending on the "dialect", you can use elsestatements. At the lowest level, though, some rather ugly logic like this works:
根据“方言”，您可以使用else语句。然而，在最低级别，一些像这样相当丑陋的逻辑是有效的：
if exist somefile.dat goto fileexists
echo file does not exist
goto alldone
:fileexists
echo file exists
:alldone
回答by Mechaflash
Syntax is as follows:
语法如下：
IF [NOT] EXIST filename command
IF [NOT] EXIST 文件名命令
You can use the [NOT] option to execute code if a file doesn't exist as opposed to if the file does exist, however this can be done as an ELSE staement in a standard IF EXIST statement.
如果文件不存在，您可以使用 [NOT] 选项来执行代码，而不是文件确实存在，但是这可以作为标准 IF EXIST 语句中的 ELSE 语句来完成。
IF EXIST stuff.txt (
ECHO It exists
) ELSE (
ECHO It doesn't exist
)
