Variables not set in the batch file [duplicate]

问题:

This question already has an answer here:

• Variables are not behaving as expected 1 answer

setlocal enabledelayedexpansion
If "%computername%"=="USER-PC" (
    set abc = ZZZ.bat
    echo %abc%
    pause
)

Here abc always shows blank. What could be the possible reason?

回答1:

You're halfway there, inasmuch as you've enabled delayed expansion. However, delayed expansion uses the ! characters rather than %, so what you need is:

setlocal enabledelayedexpansion
if "%computername%"=="USER-PC" (
    set abc=ZZZ.bat
    echo !abc!
    pause
)

Note also that:

set abc = ZZZ.bat

does not create an abc variable, it creates an abcspace one and sets it to spaceZZZ.bat, as per:

C:\Users\pax> set abc = 1
C:\Users\pax> echo .%abc%.
.%abc%.
C:\Users\pax> echo .%abc %.
. 1.
C:\Users\pax> set xyz=1
C:\Users\pax> echo .%xyz%.
.1.

You'll see I've removed the spaces around the = character to fix this.