How to concatenate strings in a windows batch file?

Question

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

I know the following command command: echos all files:

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

But now I want to put them all in a variable, add ; between them and I will repeat them all at once.
How can i do this?

 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 the Rubens solution, you need to enable Delayed Expansion of env variables (type "help setlocal" or "help cmd") so that 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 8192 bytes.

Answer 3

Note that the @fname or @ext can simply be concatenated. It:

 forfiles /S /M *.pdf /C "CMD /C REN @path @fname_old.@ext" 

renames all PDF files to filename_old.pdf