MS-DOS stuff, tips, notes, etc

Ok, this is really old school to be working in DOS, but just in case I ever need it again...

@echo off 

: PARAMETER PASSING EXERCISES
: TO RUN:
: pass_param.bat "C:\Temp\dos_test.bat"

:http://windowsitpro.com/article/articleid/13443/how-do-i-pass-parameters-to-a-batch-file.html
:When you call a batch file, you can enter data after the command that the batch file 
:refers to as %1, %2, etc. For example, in the batch file hello.bat, the following command

:clear the screen
cls

:http://talk.bmc.com/blogs/blog-gentle/anne-gentle/dos-timestamp-tips/view?searchterm=batch
:create variable to hold yyyymmdd info by using substring function
set yyyymmdd=%date:~10,4%%date:~4,2%%date:~7,2%

:clear current log and start with the following line (single >)
echo %date% %time% Starting script > %log%

:set the file log with the same name as this bat file
set log=%~n0.%yyyymmdd%.log
echo %date% %time% CREATED LOG FILE: %~n0.%yyyymmdd%.log >> %log%

echo.
echo %date% %time% CURRENT FILE RUNNING: %~nx0
echo %date% %time% CURRENT FILE RUNNING: %~nx0 >> %log%
echo.

:All the parameters in action
@echo off
echo %date% %time% passed in parameter %1
echo %date% %time% fully qualified name %~f1
echo %date% %time% drive %~d1
echo %date% %time% path %~p1
echo %date% %time% filename %~n1
echo %date% %time% file extension %~x1
echo %date% %time% short filename %~sn1
echo %date% %time% short file extension %~sx1
echo %date% %time% drive and directory %~dp1
echo %date% %time% filename and extension %~nx1


REM Prompt the user for something...
set /P myvar=Would you like to add something? 

echo.
echo Thanks!
echo.
echo You entered %myvar% 
echo.
echo %date% %time% %myvar% >> %log%