FOR command won't run in .cmd file, but runs at command prompt

Question

When I try to run file.cmd containing the following:

for /l %m in (1,1,1) do @for /f "tokens=1,2* delims=:" %a in ('findstr /n /r "^" csv\data.csv ^| findstr /r "^%m:"') do @echo %b >csv\header.csv

I get this error:

" m:")'. Unexpected at this time

But when I run that same command at a command prompt (no .cmd file), it works.

Answer 1

You realize there is a much much much simpler way to get the first line of a file into a variable.

set /p header=<data.csv
echo %header%>header.csv