How do you add a variable to a string in a batch file?

Question

I can't seem to find how to do this simple task, and this is probably answered.

How does one add a string to a variable? such as set "FileNameAndPCName = Locker\ and add %COMPUTERNAME%" to the variable so it would become like, "Locker/Bill"?

Code:

@echo off
set FileNameAndPCName="Locker\" + "%COMPUTERNAME%"
echo %FileNameAndPCName%
pause

remove spaces around `=`. They're significant in the `set` command — phuclv, May 19 '19 at 04:21
Possible duplicate of [Batch File Set Variable not working](https://stackoverflow.com/questions/19448522/batch-file-set-variable-not-working) — phuclv, May 19 '19 at 04:22
Sadly its not (I think), if I share you the entire code are you able to see what the problem is? — A random Guy, May 19 '19 at 04:53
no. questions should be self-contained. No one will click on an external link just to read the code — phuclv, May 19 '19 at 05:28
you already have an answer to the question, but to add to it. The only time `+` is used is when you use `set /a` which is for numerical evaluation. i.e `set /a num=1+2` — Gerhard, May 19 '19 at 07:45

score 0 · Accepted Answer · answered May 19 '19 at 05:46

Operations in batch is already string manipulation, therefore you don't need and can't use + to concatenate strings. Just type the whole string like this

set "FileNameAndPCName=Locker\%COMPUTERNAME%"

set FileNameAndPCName="Locker\" + "%COMPUTERNAME%" will set the variable %FileNameAndPCName% to "Locker\" + "%COMPUTERNAME%" literally (after substituting %COMPUTERNAME%. Quotes are not special in the set command. And it's also recommended to use the set "var=value" variant instead of set var=value to avoid unexpected trailing spaces at the end

How do you add a variable to a string in a batch file?

1 Answers1