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delolderthan

You can use this utility program to delete files older than a specified number of days. I wrote it because the Windows 'del' command does not have an option to do this. I did look at 'forfiles' in the Windows resource kits but it is not simple to use.

It is important to note that this program really deletes the file(s). They are NOT moved to the recycle bin and cannot be easily recovered once they are deleted.

The usage is :
delolderthan fname days [/Q] [/L]
   fname - file name which can include wildcards * and ?.
   days    - is the number of days.
   /Q       - Run quietly and do not prompt to delete each file.
   /L        - List the older files only. Do not delete them.

Example: delolderthan *.dat 5
  This command will delete all files ending in .dat in the current directory/folder older than 5 days.

If you are planning to use wildcards and the /Q option then I strongly recommend that you use the /L option first to see a list of files that would be deleted.

Important note: You use this free program at your own risk. While every care has been taken to ensure it works correctly, the author will not be responsible for any loss of data resulting from the use or inability to use this program.


rendate.bat

This is a simple but useful batch file that renames files by appending the current date to the end of the filename. For example, the command "rendate backup.bkf" will rename the file backup.bkf to backup_dd_mm_yyyy.bkf (where dd is the day, mm is the month and yyyy is the year). It is probably most useful for managing backup or log files.

To make the command "available" from any directory you will need to place it in one of the directories in the windows path such as "C:\WINDOWS".


winmand

This is a basic program to generate and explore the mandelbrot set which is a type of fractal. When you run the program it will display the mandelbrot set and the structures that surround it. You can zoom in by using the left mouse button to drag out a rectangle. If the rectangle is not exactly where you want it then just draw a new one and the old one will disappear. After drawing a rectangle around the area you are interested in you need to move the mouse pointer inside the rectangle and then click the right mouse button. The program will then blow up the rectangle to fill the whole window.

You can go back to the previous zoom level by pressing the "b" key on the keyboard.

One of the properties of fractals is that you can zoom in as far as you want and there will allways be more detail. This program has a limitation however and when you reach the limit of the accuracy, the display will appear to be blocky.


winmand source

Here is the C source code for the above program. It contains a detailed description of how the mandelbrot set is generated. It is good for anyone who is interested in learning how to write their own program to display fractals.