batch file string concatenation

Question

I have a directory for which I want to list all the .doc files with a ";"

I know the following batch command echos all the files

for /r %%i In (*.doc) DO echo %%i

But know I want to put them all in a variable, add a ';' in between and echo them all at once. How can I do that?

set myvar="the list: "
for /r %%i In (*.doc) DO <what?>
echo %myvar%

Answer 1

What about:

@echo off
set myvar="the list: "
for /r %%i in (*.doc) DO call :concat %%i
echo %myvar%
goto :eof

:concat
set myvar=%myvar% %1;
goto :eof

Answer 2

Based on Rubens' solution, you need to enable Delayed Expansion of env variables (type "help setlocal" or "help cmd") so that the var is correctly evaluated in the loop:

@echo off
setlocal enabledelayedexpansion
set myvar=the list: 
for /r %%i In (*.sql) DO set myvar=!myvar! %%i,
echo %myvar%

Also consider the following restriction (MSDN):

The maximum individual environment variable size is 8192bytes.