( was unexpected at this time - batch script

Question

I\'m using the batch script below and get an error

( was unexpected at this time.

I know that the problem is in the first line but

Answer 1

Actually, the problem is not on the first line.

The problem is that cmd does variable substitution immediately when it parses the IF statement, including its body. Therefore the line:

IF %isDefault%==y (

is problematic because isDefault isn't set when the outer IF statement is parsed, so it becomes:

IF ==y (

and hence you get the error about ( being unexpected. You can get around this by enabling the command extension (SETLOCAL ENABLEDELAYEDEXPANSION) for delayed environment variable expansion (see set /? for details). You also can rewrite your script:

@ECHO OFF
IF NOT "%1"=="" GOTO :EOF

:LOOP1
SET /P isDefault=Value Missing, do you want to use default values [1,1,10,Local Area Connection 2]?[y/n]
IF "%isDefault%"=="y" (
    SET from=1
    SET step=1
    SET to=10
    SET lan="Local Area Connection 2"
    GOTO :USERLOOP
)
IF "%isDefault%"=="n" GOTO :EOF
GOTO :LOOP1

(I made some other changes, such as using the built-in :EOF label instead of :END.)