... From: Mark Dominus To: Sent: Tuesday, August 26, 2003 2:48 PM Subject: Perl tutorial at U Penn on TuesdayMessage 1 of 2 , Aug 26, 2003View Source
----- Original Message -----
From: "Mark Dominus" <mjd-lists-nypm+@...>
Sent: Tuesday, August 26, 2003 2:48 PM
Subject: Perl tutorial at U Penn on Tuesday 2 September
This year I wrote three new tutorial classes for conferences, but I
only gave two of them in practice sessions at Penn in the spring.
I've given the new one several times now, so I don't need the
practice, but I thought it would be fun to give it in Philadelphia
As usual, I am asking for a (voluntary) donation of $10. If this
covers my expenses for the class, I will contribute 30% of the surplus
to the EFF, a non-profit legal action group devoted to defending
digital rights. (See http://www.eff.org/ for details.)
The tutorial is titled:
"How do I delete a line from a file?"
Strategies for Lightweight Databases
Tuesday, September 2.
The tutorial will start around 6:30 PM and will last until about
10:00, including a 30-minute break in the middle.
Here is the brochure description:
Many programs need cheap, convenient access to small amounts
of data. There are two commonly used solutions: Flat text
files and DBM files. This class will look at these in
detail. Whether you're looking for a good solution for storage
of your own data, or you have to deal with data stored in one
of these formats by another program, this class will equip you
with valuable tools for solving your problems.
In the first section, we'll look at techniques for managing
flat text databases and the systems programming that underlies
these. We'll examine the tradeoffs of variable
vs. fixed-length records and sorted vs. unsorted files. In the
second section, we'll take a detailed look at Tie::File, a new
standard module that provides easy access to text databases.
The third section will be an overview of Perl's 'DBM' feature,
including a comparison of the standard DBM modules. We'll see
several extremely useful but little-known features of DB_File,
the only one of these standard modules that doesn't have
Here's an outline:
Rotating log file; deleting a user
Copy the File
Using -i inside a program
Problems with -i
Essential problem with files; fundamental operations; seeking
In-place modification of records
Bytes vs. positions
Case study: lastlog
Generic text indices
Rotating log file revisited
Most important thing to know about Tie::File
Indexing with Tie::File
Immediate vs. Deferred Writing
Common DBM Implementations
What DBM Does
Small DBMs: ODBM, NDBM, and SDBM
This is NOT an introductory class; it assumes that you have some
familiarity with Perl's basic features.
The classes will be held in Wu-Chen auditorium on the first floor of
the new Melvin and Claire Levine Hall at the University of
Pennsylvania. Levine Hall is located at 3330 Walnut Street in
For directions to the University, see
A map is available at:
My usual bio says:
Mark-Jason Dominus has been programming in Perl since 1992. He
is the author of the 'Memoize', 'Text::Template', and
'Tie::File' modules, the author of the 'perlreftut' man page,
and an occasional contributor to the Perl core. He won the
2001 Larry Wall award for Practical Utility.
For more details about me, see
For more details about classes I teach, see
For more details about this class, see
We have plenty of space, but please make an advance reservation so
that I know how many handouts to bring. To reserve, please send an
email message to:
Please do circulate this notice to any people or mailing lists that
you think might want to see it.
My grateful thanks go to Helen Anderson and Chip Buchholtz of the
University of Pennsylvania School of Engineering and Applied Science
for providing the space and AV equipment for these classes, and to
JoDe Hendrick for setting it up.
Questions? Send me email.
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