how can i stop batch/cmd from erasing old lines?

answer: post #2

Worth repeating

i chaged the

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evolve_b.bat>a.txt
to

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evolve_batch.exe>a.txt
and it now writes this to the .txt

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Usage:
       evolve_batch s <time-spec> <infile.evolve> <outfile.evolve>

       evolve_batch p <infile.evolve>

       evolve_batch k <kforth_file>

       evolve_batch = <file1.evolve> <file2.evolve>

       evolve_batch rc <file.evolve> [x y]

       evolve_batch 1s <infile.evolve> <outfile.evolve>

ERROR: No arguments.


which is some of the text i want to copy i would like to copy this and what is put below it

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@echo off & setlocal & set c=n
title evolve_b

if not exist save.txt goto skip
:setup
set c=&set/p c=do you want to start from where you left off [y\n] :
echo.%c%|findstr/ix "y n yes no">nul || goto:setup

:skip
if /i %c:~,1%.==y. for /f "tokens=*" %%a in (save.txt) do set %%a
if /i %c:~,1%.==n. (
set/p var_time=time :
set/p var_in=input :
)
set/p var_out=output :

:validateYesNo
echo evolve_batch s %var_time% %var_in%.evolve %var_out%.evolve
set c=&set/p c=are the time,input and output correct [y/n] :
echo.%c%|findstr/ix "y n yes no">nul || goto:validateYesNo

if /i %c:~,1%.==n. goto:setup
 >save.txt echo var_time=%var_time%
>>save.txt echo var_in=%var_out%
cd C:\Program Files\Evolve
>temp.txt evolve_batch.exe
type temp.txt
type temp.txt>>a.txt
>temp.txt evolve_batch.exe s %var_time% %var_in%.evolve %var_out%.evolve
type temp.txt
type temp.txt>>a.txt

notes: with this method, you will lose the real-time display of evolvebatch.exe

thank you for helping me Reno
and i don't care that it does not display the info when it's run i usually leave it going unattended for an hour or so unless i want to save the info (by copying and pasting it in to excel for graphing which i don't have to do any more)
so thank you again for helping me

no problem. 

glad the script works well