Hello there how are you doing I am writing asking to see if I can get some info on areas like the following.
1.copying all files with the extension sys from c:\dos6 to a:
2.Copy all files with extension exe from c:\dos6 to a:
3. Create directories sys and com on drive a begining at the root and creating sub directories
4. create sub directory com within com
5.copy all files with the extension sys from A: into subdirectory sys on drive A.
6.list all files in executive subdirectory
6.Change default directory to sys
7. Commands you would use to erase all files in a directory sys in the root directory and all sub directories.

Sounds like a school assignment.

Here's a site to help you- out-http://www.computerhope.com/
It has a very good dos comandline section.

1. and 2.To copy files with a specific extension use: copy c:\dos\*.sys a: (Change sys for exe)
3. to 6.Reserved dos commands words like sys,copy,etc. should not be used to name folders and files.
md c:\folder
7.To erase folders and files use
deltree c: or deltree c:\myfolder
Good luck.

It also sounds like You could have use for a:
-- " -DOS command reference guide- " --

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Cool Uziel, thanks for the reference guide link! Just what I have been looking for.