JSI Tip 0493 - Windows NT Command Extensions.


Command Extension are automatically enabled in Windows NT. You can alter this behavior of the command enterpreter with the following switches:

CMD /y      Disable extensions to the Windows NT version of CMD.EXE
CMD /x      Enable extensions to the Windows NT version of CMD.EXE

You may also edit:

HKEY_CURRENT_USER\Software\Microsoft\Command Processor\EnableExtensions

Setting this REG_DWORD value to 0 disables Command Extensions for all CMD.EXE sessions (a 1 enables them).

The command extensions involve changes and/or additions to the following commands:

 
DEL or ERASE 
COLOR 
CD or CHDIR 
MD or MKDIR 
PROMPT 
PUSHD 
POPD 
SET 
SETLOCAL 
ENDLOCAL 
IF 
FOR 
CALL 
SHIFT 
GOTO 
START (also includes changes to external command invocation) 
ASSOC 
FTYPE 
To get the details, type HELP <CommandName>.

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