read then write delimited file - Batch cmd - windows

Question

Hi I have a pipe | delimited file.
I need to reverse all the numbers in there
The file looks like this
Entity|Division|Channel|200|300|800
I need to read the file an create a new one with reversed numbers
Entity|Division|Channel|-200|-300|-800
trying to make this work but, not entirely sure how to amend the text I'm getting. I need help on the :processToken procedure. How to output the tokens into a new file and add "-" and add back the delimiter |
for /f "tokens=* delims= " %%f in (M:\GPAR\Dev\EQ\Upload_Files\eq_test.txt) do (
set line=%%f
call :processToken
)
goto :eof
:processToken
for /f "tokens=* delims=|" %%a in ("%line%") do (
)
if not "%line%" == "" goto :processToken
goto :eof
Thanks

Answer 1

#echo off
set "ent_file=c:\entity.txt"
break>"%tmp%\rev.txt"
for /f "usebackq tokens=1,2,3,4,5,6 delims=|" %%a in ("%ent_file%") do (
echo %%a^|%%b^|%%c^|-%%d^|-%%e^|-%%f
)>>"%tmp%\rev.txt"
move /y "%tmp%\rev.txt" "%ent_file%"
del /q /f "%tmp%\rev.txt"
Should work if your file contains only lines like the one you've posted.
EDIT output the part after the 6th token:
#echo off
set "ent_file=c:\entity.txt"
break>"%tmp%\rev.txt"
for /f "usebackq tokens=1,2,3,4,5,6,* delims=|" %%a in ("%ent_file%") do (
echo %%a^|%%b^|%%c^|-%%d^|-%%e^|-%%f|%%g
)>>"%tmp%\rev.txt"
move /y "%tmp%\rev.txt" "%ent_file%"
del /q /f "%tmp%\rev.txt"

Answer 2

#echo off
setlocal EnableDelayedExpansion
set digits=0123456789
(for /F "delims=" %%f in (eq_test.txt) do (
set "input=%%f"
set "output="
call :processToken
set /P "=!output:~1!" < NUL
echo/
)) > new_file.txt
goto :EOF
:processToken
for /F "tokens=1* delims=|" %%a in ("%input%") do (
set "token=%%a"
set "input=%%b"
)
if "!digits:%token:~0,1%=!" neq "%digits%" set "token=-%token%"
set "output=%output%|%token%"
if defined input goto processToken
exit /B