Computer Files » command http://www.computer-files.com Everything you need to know about computer files Fri, 03 Jun 2011 12:51:04 +0000 en hourly 1 http://wordpress.org/?v=3.1.3 About the rundll.exe or rundll32.exe files http://www.computer-files.com/about-the-rundllexe-or-rundll32exe-files.html http://www.computer-files.com/about-the-rundllexe-or-rundll32exe-files.html#comments Thu, 07 Feb 2008 13:19:42 +0000 Computer Expert http://www.computer-files.com/2008/02/07/about-the-rundllexe-or-rundll32exe-files/

Located in the folder C:\Windows\System32 the ‘rundll’ file makes possible to run a DLL file as an application placing its libraries in the memory for better performance.

A few examples the rundll32.exe file can do to execute some commands in command prompt:

- creating shortcut
– locking Windows workstation
– log off, restart or/and shutdown the computer
– start screensaver
– run copy disk

The rundll32.exe file can also be found in the Task Manager in the Processes list or sometimes appears as an error message when shutting down the PC.

Here is the sample of the syntax for the rundll32.exe file:
rundll32.exe <dllname>,<entrypoint> <optional arguments>

To understand better, here is an example how to open the Control Panel:
rundll32.exe SHELL32.DLL,Control_RunDLL desk.cpl,,0 

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Definition: A batch file is a simple text file with a series of commands which are executed whenever the file is being run either manually with cmd.exe or automatically on a specific date and time.

Usually it is used to erase, move or archive files on a regular basis. The command lines are easy to learn and do not require advanced programming skills. Commands used in batch files are not case sensitive similarly to the MS-DOS commands.

The earliest and most used batch file is probably the autoexec.bat boot file. This file is loaded whenever the computer starts booting MS-DOS or Windows and contains all the commands the operating system requires to run properly.

Batch files can have different extensions depending on the operating system from which most often used are .bat, .cmd or .btm.

Some batch command examples:

@ or @ECHO OF – prevents echoing back the text after the symbol
CALL – this command is used whenever another batch file in the original one is needed to be run
CLS – used to clear screen just like in MS-DOS
IF – used to search for a condition and only in case it finds then will execute the function
REM – used to write comments
START – used to run Windows applications (ex. C:\Windows\NOTEPAD.EXE)

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