Download E-books Intermediate Perl PDF

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By Tom Phoenix, brian d foy

Perl is a flexible, robust programming language utilized in quite a few disciplines, starting from approach management to internet programming to database manipulation. One slogan of Perl is that it makes effortless issues effortless and difficult issues attainable. Intermediate Perl is ready making the jump from the simple issues to the demanding ones.

Originally published in 2003 as Learning Perl items, References, and Modules and revised and up-to-date for Perl 5.8, this publication bargains a steady yet thorough advent to intermediate programming in Perl. Written by way of the authors of the best-selling Learning Perl, it selections up the place that e-book left off. subject matters include:

  • Packages and namespaces
  • References and scoping
  • Manipulating complicated information structures
  • Object-oriented programming
  • Writing and utilizing modules
  • Testing Perl code
  • Contributing to CPAN

Following the profitable layout of Learning Perl, we designed every one bankruptcy within the booklet to be sufficiently small to be learn in precisely an hour or , finishing with a sequence of routines that can assist you perform what you might have discovered. to exploit the ebook, you simply have to be accustomed to the fabric in Learning Perl and feature ambition to move further.

Perl is a distinct language to diverse humans. it's a fast scripting instrument for a few, and a fully-featured object-oriented language for others. it's used for every thing from appearing speedy worldwide replacements on textual content documents, to crunching large, complicated units of clinical info that take weeks to procedure. Perl is what you are making of it. yet despite what you utilize Perl for, this e-book is helping you do it extra successfully, successfully, and elegantly.

Intermediate Perl is ready studying to take advantage of Perl as a programming language, and never only a scripting language. this can be the ebook that turns the Perl dabbler into the Perl programmer.

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Seeing that we don’t like combining the open mode with the filename (for an identical purposes as standard open), we’ll use one of many different calling conventions. The not obligatory moment argument is the filehandle mode: my $read_fh = IO::File−>new( 'castaways. log', 'r' ); my $write_fh = IO::File−>new( 'castaways. log', 'w' ); be aware those are the ANSI C fopen mode strings. we will be able to additionally use those with the integrated open. certainly, IO::File makes use of the integrated open behind-the-scenes. utilizing a bitmask because the mode allows extra granular keep watch over. The IO::File module provides the constants: my $append_fh = IO::File−>new( 'castaways. log', O_WRONLY|O_APPEND ); in addition to commencing named documents, we'd are looking to open an nameless transitority dossier. On structures that help this kind of factor, we create the hot item to get a read/write filehandle: my $temp_fh = IO::File−>new_tmpfile; As ahead of, Perl closes those documents while the scalar variable is going out of scope, but when that’s no longer sufficient, we will do it ourselves explicitly by way of both calling shut or undefining the filehandle: $temp_fh−>close or die "Could no longer shut dossier: $! "; undef $append_fh; Perl v5. 6 and later can open an nameless, transitority dossier if we supply it undef as a filename. We should want to either learn and write from that dossier while. in a different way, it’s a section unnecessary to have a dossier we can’t locate later: open my $fh, '+>', undef or die "Could no longer open temp dossier: $! "; IO::Scalar If we’re utilizing an historic model of Perl that can’t create filehandles to a scalar reference, we will use the IO::Scalar module. It makes use of the magic of tie behind-the-scenes to provide us a filehandle reference that appends to a scalar. This module doesn’t include the traditional Perl distribution so we’ll need to set up it ourselves: use IO::Scalar; my $string_log = ''; my $scalar_fh = IO::Scalar−>new( \$string_log ); print $scalar_fh "The Howells' deepest seashore membership is closed\n"; Now our log message results in the scalar variable $string_log rather than a dossier. What if we wish to learn from our logfile notwithstanding? We do an identical factor. during this instance, we create $scalar_fh simply as we did ahead of, then learn from it with the road enter operator. In our whereas loop we’ll extract the log messages that comprise Gilligan (which is so much of them, on account that he’s continuously a part of the mess): use IO::Scalar; my $string_log = ''; my $scalar_fh = IO::Scalar−>new( \$string_log ); whereas( <$scalar_fh> ) { subsequent until /Gilligan/; print; } IO::Tee What if we wish to ship output to a couple of position at a time? What if we wish to ship it to a dossier and reserve it in a string whilst? utilizing what we all know already, we’d need to do anything like this: open my $log_fh, '>>', 'castaways. log' or die "Could no longer open castaways. log"; open my $scalar_fh, '>>', \ my $string; my $log_message = "The Minnow is taking over water! \n" print $log_fh $log_message; print $scalar_fh $log_message; shall we shorten bit so we basically have one print assertion. We use foreach to iterate during the filehandle references, alias each one in $fh in flip, and print to every one: foreach my $fh ( $log_fh, $scalar_fh ) { print $fh $log_message; } That’s nonetheless a piece an excessive amount of paintings.

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