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1985-08-06
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LUU - Version 2.05b - 7/18/85
(c) Copyright Vernon D. Buerg 1985
Usage: LUU library[.LBR] filename(s) [/N]
Public domain. For personal use only.
Commercial use prohibited.
AAI Systems, Inc
456 Lakeshire Drive
Daly City, CA 94015
I downloaded this program this morning directly from Vernon
Buerg's system. It is so new that he has not written a doc file
for it yet, so I am writing a few notes on its usage.
This version of LUU combines library and squeeze functions in one
program, and is a great time and disk space saver. It is the
perfect companion to Buerg's LUE program -- current version 2.10.
LUE extracts and unsqueezes files in a library; LUU builds the
library in the first place, squeezing all files larger than 1K in
the process.
Examples of the program's syntax follow:
LUU libname example.doc test.doc example.exe
(creates libname.lbr with the 3 files example.dqc,
test.dqc and example.eqe)
LUU libname *.* (creates library with squeezed versions
of all files in the current directory)
LUU libname example.* test.doc (same as first command,
assuming the same files are in the current directory)
If you use the /N switch, the files inside the library will not
be squeezed.
PROS and CONS of a Library File with Squeezed Files Rather
than a Squeezed Library
A squeezed library (.lqr) may be a little smaller, but that is
its only advantage. A .lqr file is a pain -- you need to
unsqueeze the whole thing just to get at one file inside. A
library of squeezed files can be manipulated with the wonderful
lqtype program to view files inside of it. It can also more
readily be updated with new files, without needing to unsqueeze
the whole thing first. In the event of a transmission error, you
may be able to salvage part of a library of squeezed files; a
squeezed library is a total loss.
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LUU - Version 2.05b - 7/18/85 Help File
LUU vs ARC
No comparision in speed -- LUU is MUCH faster. ARC may produce
smaller files because it uses a different compression algorithm,
but the difference usually will not be too substantial and
depends greatly on the type of files in the library. In light of
the fact that LUU uses the LU standard that is also supported by
CP/M and Unix, which is not true of ARC, I prefer it.
CRC Checking
Earlier versions of Vernon Buerg's LUU did not store CRC values
for library members and, for that reason, I did not use the
program. This version makes use of CRC in a limited way -- it
stores a CRC value for the library directory and for any files
that it does not squeeze, but not for files that it does squeeze.
I assume the logic of this is that for squeezed files, a checksum
value is stored inside the file itself, and is verified as the
file is unsqueezed. I have no major quarrel with that, though I
would like to be able to verify the integrity of a library file
without having to extract and unsqueeze it. If a CRC is stored
for the file, I can use the -c option of the LUPower program to
verify it; I can't do that if the library was created with LUU.
All in all, not a major drawback but one I hope Buerg will fix in
later versions.
I encourage you to use this program for files you upload to my
system and would like to thank Vernon Buerg for making this
wonderful program available to us all.
Robert Blacher
Sysop, Computer Connections
Washington, D.C.
(202) 547-2008
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