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Tutorial on Basic Windows 2000 DOS
This Section Will Cover
- 00. What a file is under win enviroment
- 01. What a variable is in %win2k% batch and how to create them.
- 02. What echo echo. @echo off does.
- 03. What operators like > and >> and | do.
- 04. What a ::comment is.
- 05. What & does and how to use it &::creatively.
- 06. What 'DIR' and 'SORT' is and does
- 07. What a * and a ? mean to the DOS shell.
- 08. What GOTO _is when used with :_labels, also using PING to create a delay.
- 09. What if "statements"=="are and what they do".
- 10. What a basic "for" loop is/does.
- 11. How to use low interger values with variables.
- 12. How to parse strings into substrings.
- 13. How to echo non-echoable characters.
- 14. How to pass %arguments to a .bat file.
- 15. Summary
Ok * (asterisk) means 1 or more characters. ? means only 1 character.
You commonly use these with DIR. If you would do DIR /AD /B *.mp3 that would print all the files
that have the .mp3 extension, in other words all your .mp3's. However if you would do DIR /B ?.mp3 that
would only print out the .mp3's you have that have 1 character for a basename. (basename is the
name of a file that is not part of the extension).
For example if you had A.MP3 and ABC.MP3 DIR /B *.mp3 would print out...
A.MP3
ABC.MP3
But if you used Dir /B ?.MP3 it would only print out...
A.MP3
You can use * and ? together. Lets say you want to print out all your .mpg files and .mp3 files, but
you did NOT want to print out your .mov files. You could do DIR /B *.mp? that would print ONLY
the files that have any basename, but the extension must be 3 letters long and the first 2 letters of
the extension must be mp. So it would print out all your .mp3's and .mpg's. If you had a file
with the extension of .mpv or .mpa DIR /B *.mp? would also print them out.
DIR is not a case sensitive command, neither is anything else besides FIND really. We will
get to that later.
Click here to continue
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