Exercises, examples and other material relating to training module P602. This topic is presented on public courses
Perl for Larger Projects,
Extra Day
Perl for Larger Projects - Objects, huge data, SQL databases, XML, efficiency and other topics.
This advanced course takes the Perl programmer through
... http://www.wellho.net/course/plfull.html [course] |
Extra Days - Subjects not covered on regular public courses!
We offer a wide range of public courses which well cover the training needs of the majority ... http://www.wellho.net/course/axfull.html [course] |
Perl has many built in functions for file and directory handling and you should use them in preference to shelling out in your scripts because:
• ... http://www.wellho.net/mouth/1225_Per ... dling.html [short article] |
div class= introsubheads WHY DO WE NEED FILE LOCKING BR /div
If several processes wish to READ the same data file at the same time, and no process ... http://www.wellho.net/solutions/general- ... cking.html [longer article] |
From this week's Perl course:
opendir(DH, ".");
while ($igot = readdir(DH)) {
next if ($igot =~ /^\.{1,2}$/);
print "igot $igot\n";
... http://www.wellho.net/mouth/1832_Pro ... -Perl.html [short article] |
During courses, questions arise. "I'll get back to that" could make people feel that I'm brushing something off ... except that I explain, early on, ... http://www.wellho.net/mouth/975_Answ ... tions.html [short article] |
"There are six ways of doing anything in Perl." So say I on Perl courses and just occasionally I come up with an example that proves it. This one doesn't ... http://www.wellho.net/mouth/1709_The ... -Perl.html [short article] |
File locking, database file handling, directory manipulation and more. This module also covers Perl's format and write commands used for traditional text formatting applications, but now of specialist interest.
This topic is presented on public courses
Perl for Larger Projects,
Extra Day
Examples from our training material
| bchop | Random access to a file - using a binary chop |
| flockdemo | Co-operative file locing with flock |
| ftype | Establishing the type of a file system object |
| huge | finding lost disc space - hunting for huge files |
| huge2 | A progress line - hunting for huge files |
| loglook | reading a specific number of bytes |
| ndd | Accessing NDBM files |
| nf | Use of $! to find out why an action failed |
| nopen | $! in a string and a numeric context |
| pfc | Copying a file block by block |
| pls | Four ways of finding the contents of a directory |
| recur | recursively scanning directories |
| webfiles | Using typeglobs to handle an effective array of files |
| wr_loop | Using file locking constants |
Background information
Some modules are
available for download as a sample of our material or under an
Open Training Notes License for free download from
http://www.training-notes.co.uk.
Topics covered in this module
Basic file handling.
Opening files.
Reading from file.
Writing to file.
Enquiring about a file.
Other uses of the file interface.
Arrays of file handles.
Directory Handling.
Going recursive.
Random access files.
An example using a sorted, fixed-length record file.
File Locking.
Alternative schemes.
Database files.
Built-in file system handlers.
Complete learning
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