How can a batch script do the equivalent of “cat << eof”?

Question

In Linux (Bash) there is a very useful functionality for dumping literal text out to another file like this:

cat > see.txt << EOF
contents going int         


        

Answer 1

+1, Interesting application! I modified your code for a simpler and faster version:

@echo off
call :catMyChunk myCustomText see.txt
exit /b

goto:myCustomText
This is my test file
Hope you like it.

% and these %
! these too
yeah
:myCustomText

:catMyChunk
::Should call this function with 2 args, MYDELIM and outFile.txt
::where is to be catted to outFile.txt
::and text starts with goto:MYDELIM
::and ends with :MYDELIM
setlocal DisableDelayedExpansion
set searchStart=goto:%~1
set searchStop=:%~1
set outFile=%~2
if exist %outFile% del %outFile%
set copyFlag=No
echo No> copyFlag
for /f "delims=" %%a in (%~f0) do (
    set "oneLine=%%a"
    setlocal EnableDelayedExpansion
    if !copyFlag! == No (
        if !oneLine! == %searchStart% echo Yes> copyFlag
    ) else (
        if !oneLine! == %searchStop% (
            echo No> copyFlag
        ) else (
            echo/!oneLine!>> %outFile%
        )
    )
    endlocal
    set /p copyFlag=< copyFlag
)
endlocal
goto :eof

I also created another version that looks more like the Linux version, that is, the lines to copy are placed directly after invoking the routine, and the execution continue after the last copied line. Of course, to make this possible the routine is not invoked via call, but entered with a goto, and when the routine ends it execute a goto %MYDELIM% instead of a "return" (exit /b or goto :eof). Also, because a goto can not have parameters, the "parameters" are defined in variables before the invocation.

@echo off
set searchStop=EndOfMyText
set outFile=see.txt
goto :catMyChunk EndOfMyText
This is my test file
Hope you like it.

% and these %
! these too
yeah
:EndOfMyText
exit /b


:catMyChunk
::Before JUMP to this "function" define 2 vars: searchStop and outFile
::where is to be catted to %outFile%
::and text starts with goto :catMyChunk %searchStop%
::and ends with :%searchStop%
setlocal DisableDelayedExpansion
set searchStart=goto :catMyChunk %searchStop%
if exist %outFile% del %outFile%
set copyFlag=No
echo No> copyFlag
for /f "delims=" %%a in (%~f0) do (
    set "oneLine=%%a"
    setlocal EnableDelayedExpansion
    if !copyFlag! == No (
        if /I !oneLine! == !searchStart! echo Yes> copyFlag
    ) else (
        if !oneLine! == :%searchStop% (
            echo No> copyFlag
        ) else (
            echo/!oneLine!>> %outFile%
        )
    )
    endlocal
    set /p copyFlag=< copyFlag
)
endlocal
goto %searchStop%

EDIT

This new version is even faster and now works with all special cases, including empty lines:

:catMyChunk
::Should call this function with 2 args, MYDELIM and outFile.txt
::where is to be catted to outFile.txt
::and text starts with goto:MYDELIM
::and ends with :MYDELIM
setlocal EnableDelayedExpansion
set searchStart=goto:%~1
set searchStop=:%~1
set outFile=%~2
if exist %outFile% del %outFile%
findstr /n ^^ "%~f0" > pipeline.txt
call :seekMyChunk < pipeline.txt
del pipeline.txt
exit /B

:seekMyChunk
set oneLine=:EOF
set /P oneLine=
if !oneLine! == :EOF goto startNotFound
set oneLine=!oneLine:*:=!
if not !oneLine! == %searchStart% goto seekMyChunk
:catNextLine
set oneLine=:EOF
set /P oneLine=
if !oneLine! == :EOF goto stopNotFound
set oneLine=!oneLine:*:=!
if !oneLine! == %searchStop% goto :eof
echo/!oneLine!>> %outFile%
goto catNextLine
:startNotFound
echo Error finding start delimiter for %searchStart% in catMyChunk 
goto :eof
:stopNotFound
echo Error finding stop delimiter for %searchStop% in catMyChunk 
goto :eof