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The Perl CD Bookshelf v4.0 by Linda Mui, Inc O'Reilly & Associates, O'Reilly & Associates

Posted On March 23, 2017 at 8:11 am by / Comments Off on The Perl CD Bookshelf v4.0 by Linda Mui, Inc O'Reilly & Associates, O'Reilly & Associates

By Linda Mui, Inc O'Reilly & Associates, O'Reilly & Associates Inc

Model 4.0 of O'Reilly's The Perl CD Bookshelf provides programmers handy on-line entry to their favourite Perl books, all from their CD-ROM force. we've got up-to-date this best-selling product with digital types of six well known books. integrated are the second one versions of Perl in a Nutshell, and learning typical Expressions; the 3rd versions of studying Perl and Programming Perl; and a couple of new titles: studying Perl gadgets, References, and Modules, and the long-awaited moment version of Perl Cookbook. A paperback model of Perl in a Nutshell rounds out this outstanding package deal. it's also helpful content material directly from the O'Reilly community. Formatted in HTML, The Perl CD Bookshelf, model 4.0, will be accessed with any net browser. as well as person indexes for every publication, there's a grasp index for the whole library. With this CD Bookshelf, programmers get an entire Perl library they could simply hold wherever.

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For example, the localtime function returns a nine-element list in list context: ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime( ); But in a scalar context, localtime returns the number of seconds since January 1, 1970: Chapter 4. The Perl Language 53 54 Chapter 4. The Perl Language $now = localtime( ); Statements that look confusing are easy to evaluate by identifying the proper context. For example, assigning what is commonly a list literal to a scalar variable: $a = (2, 4, 6, 8); gives $a the value 8.

To make life easier, the manpages are divided into separate sections so you don't have to wade through hundreds of pages of text to find what you are looking for. You can read them with either the man command or perldoc. Run man perl or perldoc perl to read the top-level page. This page in turn directs you to more specific pages. Or, if you know which page you want, you can go directly there by using: % man perlvar or: % perldoc perlvar The following table lists the sections in a logical order for reading through them: Section Description perl Overview (the top level) perldelta Changes since previous version 32 Chapter 2.

While loops The while statement repeatedly executes a block as long as its conditional expression is true. For example: while () { chomp; print OUTFILE, "$_\n"; } This loop reads each line from the file opened with the filehandle INFILE and prints them to the OUTFILE filehandle. The loop will cease when it encounters an end-of-file. If the word while is replaced by the word until, the sense of the test is reversed. The conditional is still tested before the first iteration, though. The while statement has an optional extra block on the end called a continue block.

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