Computername variable in cmd

Question

In CMD the following variable will give you the name of the computer: %COMPUTERNAME%

I need a variable that takes a part of the computername.

I need a if statement that checks if the computername contains "KM" at the start and 00 at the end. It should not look at the number between KM and -00

KM100-00
KM200-00

Answer 1

This works here:

echo %computername%| findstr "^KM.*00$" >nul && echo found the right format

Answer 2

You can do this with substring commands, as per the following transcript:

pax> set xyzzy=KM100-00 KM200-00

pax> echo %xyzzy%
KM100-00 KM200-00

pax> echo %xyzzy:~0,2%
KM

pax> echo %xyzzy:~-2,2%
00

pax> if %xyzzy:~0,2%==KM if %xyzzy:~-2,2%==00 echo yes
yes

That final (chained) if statement is the one you're looking for to see if your variable starts with KM and ends with 00.

The expression %X:~Y,Z% will give you the Z characters starting at position Y (zero-based) of the variable X. You can provide a negative value of Y to make it relative to the end of the string.

Answer 3

echo %computername%| findstr /I /b "KM" | findstr /i /e "00" && echo computer name is like KM-XX-00

You can try also with hostname instead of echo %computername%

Answer 4

I recommend you to read this page, which is about substring usage in command prompt.

And why dont you try this;

set str=KM2000-00
echo.%str%

set pre=%str:~0,2%
echo.%pre%

set pst=%str:~-2%
echo.%pst%

IF %pre% == KM( IF %pst% == 00( echo.true ) )

pause