Hello, I have a for lookp that checks through a list of computer names in a text file and attempts to ping each one twice. for /f %i in (CompNames.txt) do Ping %i -n 2 what i would realy like to say is also that if %errorlevel%==0 or basically if the PC responds to ping then redirect %i to a text file. I've added "& if %errorlevel%==0 echo %i >> Output.txt" but of course all it does is ping and also echo all the time. Thanks in advance.

When you check %errorlevel% inside the loop, %errorlevel% is converted to a number before the loop starts, and never changes value during the loop. You can use the command setlocal enabledelayedexpansion and !errorlevel! instead. But, more succinctly, just use IF NOT ERRORLEVEL 1.

Hi Klint... I tried that suggestion and couldnt get it to work. Could you advise on what I am doing wrong here please? (I actually tried a few different variants.) From the following example, all I get returned in Output.txt is "%i" setlocal enabledelayedexpansion for /f %%i in (Compnames.txt) do Ping %%i -n 2 if !errorlevel!==0 echo %%i >> Output.txt

It worked perfect for me. Thanks Klint Hello lee123abc, I could be wrong but I think that at least above you are missing the () on after the DO command thus it shoudl be: setlocal enabledelayedexpansion for /f %%i in (Compnames.txt) do (Ping %%i -n 2 if !errorlevel!==0 echo %%i) >> Output.txt I hope it was that simple. Regards to all.

I think AJ is right. Another way of doing it is this: for /f %%i in (Compnames.txt) do (Ping %%i -n 2 && echo %%i>>Output.txt) The echo command will only be executed if the Ping command succeeds.

Thanks Klint, Is that what && means? If you could describe && in a short sentence what would you say? Thanks a lot.

AJ, From http://www.robvanderwoude.com/conde... 1. command1 & command2 means: Execute command2 after execution of command1 has finished 2. command1 && command2 means: Execute command2 only if execution of command1 has finished successfully (execute command1 then, if not errorlevel 1 execute command2) 3. command1 || command2 means: Execute command2 only if execution of command1 has finished unsuccessfully i.e., execute command1 then IF ERRORLEVEL 1 execute command2 -- Holla.