DosTips.com

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setx ""C:\ATI Technologies""
or
setx \"C:\ATI Technologies\"

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>echo %path%
C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\PRGMSYS\ATI Technolog
ies\ATI.ACE\Core-Static;D:\SYS\HD\Diskeeper10\

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http://msdn.microsoft.com/en-us/library/yfdfhz1b(v=vs.85).aspx

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reg add $Path /v $key "start quoted \"data\" end quoted" /f

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::--------------------------------------------------------------------------------------------------------------------------
set "$Defines=@RegWrite" &set "$Details=Write to registry"
::
set ^"$Usage.%$Defines%=^
 Usage: %%@forU%% ( 'r#Path, r#Key, o#Data, o#Type, o#error.bool' ) %%%$Defines%%% %$n1c%
  r?Path  : Path of registry object %$n1c%
  r#Key   : Key  of registry object %$n1c%
  o#Data  : data of registry object %$n1c%
  o#Type  : type of registry object %$n1c%
  o#error.bool: 0 for always return, 1 for always PANIC %$n1c%
 ReturnConsole: Contents of $Key %$n1c%
  $error      : unaffected by function, panic otherwise "
::
2>%@DNul% ( %@forA% ( '"%$Defines%"¦"EnableDelayedExpansion"' ) %@Macro.Begin% )
::(
%   % set ^"%$Defines%=!@Udelim! ( %$n1c%

%      % !@forEL! ( '%$Defines%, "r?Path=%%~a", "r#Key=%%~b", "o#Data=%%~c", "o#Type=%%~d", "o#error.bool=%%~e"' ) !@LeadIn! %$n1c%
%      % !@n2echo! %$Defines%: '^^^!$Key^^^!' %$n1c%

%      % !@forEL! ( '@forU, @Declare.AsReg, $return, $Path, $Key, $Data, $Type, "^!$error.bool^!"' ) !@CallMacro! %$n1c%
%      % if defined $Data set "$Data=^!$Data:""=\"^^^!^^^" %$n1c%
%      % ^>nul reg add "^!$Path^!" /v "^!$Key^!" /t ^^^!$type^^^! /f /d "^!$Data^!" %$n1c%
%      % set /a $error = ^^^!ErrorLevel^^^! %$n1c%

%      % !@IfErrorBoolExit! %$n1c%
%      % !@nError! %$n1c%
%      % !@LeadOut! %$n1c%
%   % )"
::)
2>%@DNul% %@Macro.End%
::
%@forU% ( '$ED.Path, FileOpen, This""Works""' ) %@RegWrite%
::
%@COMMIT%
::--------------------------------------------------------------------------------------------------------------------------
::
goto :skip "()"
%@endoftest%
:skip ()

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C:\rara>dir /b
file.txt

C:\rara>type file.txt
house
fish
dog
C:\rara>ren file.txt file.bat

C:\rara>prompt the

thefile >file2
'house' is not recognized as an internal or external command,
operable program or batch file.
'fish' is not recognized as an internal or external command,
operable program or batch file.
'dog' is not recognized as an internal or external command,
operable program or batch file.

theprompt $p$g

C:\rara>type file2

thehouse

thefish

thedog

C:\rara>

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@Echo. Fully specified file name.| CHOICE /n /c:abcdefgh.> NUL
  For %%D in (A B C D E F G H ) do if errorlevel H%%D set D=%%D
  Echo. The drive letter in your Fully specified file name: %D%