DOS ain't dead

save & restore environment (Developers)

posted by jadoxa  , Queensland, Australia, 08.03.2026, 01:39

> COMMAND.COM is from EDR DOS 20250427

This is failing because it is not getting the key, it is getting the prefix of the key.

C:\>type test.bat
set d11=d11
set d12=d12
set d13=d13
set D1=d1
set D1=D1
set

C:\>command.com /c set | tail -1
COMSPEC=J:\COMMAND.COM

C:\>command.com /c test.bat | tail -4
COMSPEC=J:\COMMAND.COM
D13=D13
D1=d1
D1=D1


(COMSPEC is J: because I'm actually running this in MSDOS Player in Win10.)

When it gets the key it doesn't check there's an equals after it, hence the key will match any other variable that starts with it.

Complete thread:

• save & restore environment - bencollver, 28.02.2026, 00:52 (Developers)
  • save & restore environment - Rugxulo, 28.02.2026, 03:18
    • save & restore environment - bencollver, 28.02.2026, 04:26
      • save & restore environment - Rugxulo, 01.03.2026, 00:24
  • save & restore environment - boeckmann, 28.02.2026, 10:23
    • save & restore environment - bencollver, 28.02.2026, 15:20
      • save & restore environment - boeckmann, 28.02.2026, 19:26
        • save & restore environment - bencollver, 01.03.2026, 15:12
        • save & restore environment - bencollver, 08.03.2026, 00:45
          • save & restore environment - jadoxa, 08.03.2026, 01:39
            • save & restore environment - bencollver, 08.03.2026, 02:05
              • save & restore environment - boeckmann, 08.03.2026, 22:23
                • save & restore environment - boeckmann, 09.03.2026, 17:15
                  • save & restore environment - bencollver, 09.03.2026, 20:09