IF EXIST: The syntax of the command is incorrect.

Batch 脚本中使用 IF EXIST 语句时，总是提示

The syntax of the command is incorrect.

原始 bat 脚本如下：

ECHO OFF
SET project="C:\Temp"

IF EXIST %project%\build.log(
ECHO File found
)ELSE(
ECHO File missing
)

原因是遗漏了起关键作用的 空格。

ECHO OFF
SET project="C:\Temp"

REM There must be a space placed before the parenthesis (
REM 圆括号 ( 前要留有一个空格。
IF EXIST %project%\build.log (
ECHO File found
) ELSE (
ECHO File missing
)