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- DOWN - Substitute for CD
- User's Guide
- Version 2.0
-
-
- Copyright (c) 1988
- James Shoffit
- 124 Valerie Lane
- Sherman, Texas 75090
- (214) 892-1696
-
-
- Purpose
- -------
-
- DOWN is a substitute for the DOS CD command, but also provides
- the ability to descend to subdirectories without specifying
- the full subdirectory name. Basically, it is for those who want
- to fly around their directory structure from the command line.
-
-
- Installation
- ------------
-
- Installation merely allows you to choose whether or not you want
- error messages and/or showing current directory. If the version
- of DOWN already works like you want it to, then don't bother
- with DOWNINST.
-
- Installation is accomplished by typing DOWNINST at the DOS
- prompt. DOWNINST requires a file, DOWN2.EXE, to be in the
- current directory. You will be asked two easy-to-answer
- questions before a working version of DOWN is produced.
-
- 1. Do you want error messages ?
-
- If you answer "Y" then DOWN will notify you if an error has
- been made in the command line, or if the destination to
- which you have asked DOWN to take you does not exist. For
- example, if you were in the root directory, and issued the
- command DOWN .., it would reply "Cannot ascend another
- level." You will also be notified if a specified
- subdirectory was not found.
-
- If you answer "N" then DOWN will never issue a message.
-
- 2. Do you want DOWN to show directory after each move ?
-
- For those who do not specify a prompt of $P$G (to always
- show the current drive and path in the prompt), answering
- "Y" to this question forces DOWN to display the directory
- you are left in when it terminates.
-
- Now that DOWNINST has created DOWN.EXE, you may delete
- DOWN2.EXE. If you ever wish to re-install, you may simply
- rename DOWN.EXE to DOWN2.EXE and run DOWNINST again.
-
- DOWN.EXE should now be placed in a location pointed to by your
- path and renamed to something convenient. Many like to call it
- DO.EXE or D.EXE to minimize typing (which is the primary reason
- this program was written).
-
-
- Replacing CD with DOWN (For those who use CED)
- ----------------------------------------------
-
- If you use CED this will be very easy. If you don't use CED,
- you should. It is one of the most helpful, timesaving utilities
- ever. Look it up on a BBS near you.
-
- Anyway, all you have to do is set up a SYNonym which equates CD
- to the full path name for DOWN. Example :
-
- CED SYN CD C:\UTILS\DOWN
-
- Now, whenever you use the CD command, it will automatically run
- DOWN instead of the DOS CD command. So, to go to your
- \COMM\DOWNLOAD directory, you could just say CD \CO\DO.
-
-
- Operation
- ---------
-
- DOWN [drive:][path]
-
- Yes, it's that easy. Without a parameter it takes you to the
- first subdirectory located under your current directory.
-
- Path is merely a string telling DOWN where to take you. It
- differs from the CD command in that you don't need to specify
- the full directory name for DOWN to find it. DOWN merely
- searches for the substring you specify with a * wildcard
- appended to it.
-
- Before we all get too confused, a few examples might elucidate
- things a bit :
-
- DOS Command DOWN Command
-
- CD \UTILITY\PCTOOLS DOWN \U\PCT
- CD .. DOWN ..
- CD ..\PASCAL DOWN ..\PA
-
- However, if you had several top-level directories which began
- with the letter U, DOWN would only take you to the first one.
- My phrase to describe proper usage is "You may abbreviate to
- the point of ambiguity."
-
- In addition to the DOS "\" delimiter, the UNIX "/" delimiter
- is also allowed. And if you like VAX/VMS as much as I do, you
- can also use the "[" and "." just like DEC uses. You can mix
- and match however you choose. Again, examples to keep us clear :
-
- The following are all equivalent commands :
-
- DOWN \UT\PC
- DOWN /UT/PC
- DOWN [UT.PC
- DOWN /UT\PC
- DOWN [UT/PC
- DOWN /UT.PC
- (You get the idea)
-
- Also, a "-" can be substituted for ".." (again borrowed from
- VMS) anytime you want to move up a level in your directory tree.
-
- Another interesting rule is that delimiters need not be
- delimited. (sounds strange). Example :
-
- CD ..\TURBO
- DOWN ..\TURBO
- DOWN ..TURBO <-- See, ".." runs into "TURBO"
-
- are all equivalent commands.
-
- Or, if you really want to conserve keystrokes, you could say
-
- DOWN -TURBO
-
- Similarly, to go up two levels, rather than having to type
-
- CD ..\.. you could say DOWN --
- or even DOWN ..\..
- or even DOWN .... (confused ?)
-
- The DOS CD Command does not allow you to switch drives, so of
- course, DOWN does. Putting a drive letter (with colon) in front
- of your path causes DOWN to first switch to the specified
- drive, and then proceed down (or up) your directory tree from
- your current directory for that drive.
-
- CD D:\ARC would take you to the D:\ARCFILES directory.
-
-
- Limitations
- -----------
-
- 1. You must specify enough characters for DOWN to find
- the intended subdirectory.
-
- So, if you have a \TURBO directory and a \TURBOC directory,
- the only way to get to the \TURBOC is to say
-
- DOWN \TURBOC
-
- I do have a mind-reading algorithm in the works, though.
- Look for it in the Fall 89 release :)
-
- 2. If you name a directory starting with a "-" character (which
- IS possible), you will have trouble getting into it. Anytime
- DOWN encounters a "-" in its parameter, it bumps you UP a
- directory, not down into a "-" directory.
-
- I could (I suppose) check to see if a "-" directory exists
- before moving up, but that would take extra code, and I
- didn't figure many people would do this sort of thing.
-
- 3. This isn't really a limitation, but I figure I'll say it.
- If you don't have a hard disk, this program is pretty much
- useless.
-
-
- Technical Specs
- ---------------
-
- Characters that start you at the root directory :
-
- "/", "\", "["
-
- Characters that delimit a substring for descending :
-
- "/", "\", "."
-
- Substrings responsible for moving up a directory :
-
- "..", "-"
-
-
- History
- -------
-
- DOWN was originally written on VAX/VMS at North Texas State
- University (now known as University of North Texas). The VMS
- method of changing directories (called SET DEFAULT) was
- cumbersome, to say the least.
-
- SET DEFAULT DUA2:[JAMES.PROGRAMS.PASCAL]
-
- is not my idea of a fun command line to type. Lee Harper (a
- fellow programmer, now working in San Diego) and I combined
- ideas for shortening this. We wrote a program in DCL (Digital
- Command Language) which let you set default to an abbreviated
- directory name. Billy Barron (now Vax System Manager at UNT)
- suggested that I give the program the ability to descend
- multiple directories (like DOWN does now), and with his help, we
- modified the program to do so. The three of us had heard (and
- it made sense) that the shorter a program is, the faster it runs,
- so we made a restriction on our code : it had to fit on a single
- page. So, with a 23 line maximum the original code became a
- mastery of fantastic hacks, and evolved into a utility I just
- can't live without.
-
- When I became a PC hacker, I wanted my DOWN. So, using Turbo
- Pascal 3.0, I wrote DOWN.PAS. The first version would only go
- down into subdirectories, and was basically flaky. It was never
- released.
-
- So, I bought Turbo Pascal 4.0 and completely rewrote the whole
- program to bring us up to DOWN Version 2.0. It is much faster,
- much smaller (thanks, Borland) and seems to be fairly bug-free.
-
- The next version will probably be written in Turbo Assembler just
- to cut down the code size. My free time ahs been very limited of
- late, but I will eventually get around to it.
-
-
- Credits
- -------
-
- James Shoffit - Main design, idea of abbreviations, TP4 conversion
- Billy Barron - Multiple directory descending, debugging (VMS)
- Lee Harper - Logical translations (VMS), code bumming
- Sean Wheeler - Debugging, Ideas, inspiration and documentation
-
-
- Rules
- -----
-
- 1) Enjoy the program.
-
- 2) If you like it, or find a bug, send me a postcard or e-mail.
- (e-mail will get responded to much quicker!)
-
- 3) Pass it around.
-
- 4) There is no rule #4.
-
-
- I can be contacted at :
-
- USMAIL : 124 Valerie Lane, Sherman, TX 75090
- BITNET : JAMES@UNTVAX
- THENET : NTVAXB::JAMES
- INTERNET : james@vaxb.acs.unt.edu
- SPAN : UTSPAN::UTADNX::NTVAXB::JAMES
-