Advanced Perl Programming (2nd Edition) by Simon Cozens

Advanced Perl Programming (2nd Edition) by Simon Cozens

By Simon Cozens

With a global neighborhood of clients and greater than one million committed programmers, Perl has confirmed to be the simplest language for the newest developments in computing and business.

Every programmer needs to stay alongside of the newest instruments and strategies. This up to date model of Advanced Perl Programming from O'Reilly provides the fundamental wisdom of the fashionable Perl programmer. no matter what your present point of Perl services, this booklet may help you push your talents to the subsequent point and turn into a extra entire programmer.

O'Reilly's so much high-level Perl educational thus far, Advanced Perl Programming, moment version teaches you all of the complicated recommendations for production-ready Perl courses. This thoroughly up to date advisor in actual fact explains strategies akin to introspection, overriding built-ins, extending Perl's object-oriented version, and checking out your code for better stability.

Other themes include:
* advanced info buildings
* Parsing
* Templating toolkits
* operating with normal language information
* Unicode
* interplay with C and different languages
additionally, this consultant demystifies as soon as advanced subject matters like object-relational mapping and event-based development-arming you with every little thing you must thoroughly improve your skills.
Praise for the second one Edition:

"Sometimes the largest hurdle to challenge fixing isn't the topic itself yet really the sheer variety of modules Perl offers. Advanced Perl Programming walks you thru Perl's TMTOWTDI ("There's a couple of solution to Do It") woodland, explaining and evaluating the easiest modules for every activity so that you can intelligently practice them in various situations." --Rocco Caputo, lead developer of POE

"It has been stated that sufficiently complex Perl code is indistinguishable from magic. This publication of spells is going far to unlocking these secrets and techniques. It has the ability to rework the main humble programmer right into a Perl wizard." --Andy Wardley

"The details right here isn't theoretical. It provides instruments and strategies for fixing genuine difficulties cleanly and elegantly." --Curtis 'Ovid' Poe

" Advanced Perl Programming collects richly deserved wisdom from the superior programmers within the Perl group, and explains it in a fashion that even newbies can follow immediately." --chromatic, Editor of Perl.com

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Extra info for Advanced Perl Programming (2nd Edition)

Example text

Is set to the exit code of the last-executed command, and $_ is set to the last argument to that command. $! contains the PID of the last command executed in the background, and $- is set to the option flags currently in effect. I’ll discuss these parameters in more detail as they come up in the course of writing scripts. Variables A variable is a parameter denoted by a name; a name is a word containing only letters, numbers, or underscores and beginning with a letter or an underscore. Values can be assigned to variables in the following form: name=VALUE Many variables are set by the shell itself, including three you have already seen: HOME, PWD, and PATH.

These are 0, 1, and 2, respectively. The stream names are also often contracted to stdin, stdout, and stderr. I/O streams can be redirected to (or from) a file or into a pipeline. Redirection: >, >>, and < In Chapter 1, you redirected standard output to a file using the > redirection operator. 13 CHAPTER 2 „ INPUT, OUTPUT, AND THROUGHPUT When redirecting using >, the file is created if it doesn’t exist. If it does exist, the file is truncated to zero length before anything is sent to it. You can create an empty file by redirecting an empty string (that is, nothing) to the file: printf "" > FILENAME or by simply using this: > FILENAME Redirection is performed before any command on the line is executed.

37 CHAPTER 4 „ COMMAND LINE PARSING AND EXPANSION When the file name on the command line is read, it produces the output of the command. Process substitution can be used in place of a pipeline, allowing variables defined within a loop to be visible to the rest of the script. In this snippet, totalsize is not available to the script outside the loop: $ ls -l | > while read perms links owner group size month day time file > do > totalsize=$(( ${totalsize:=0} + ${size:-0} )) > done $ echo ${totalsize-unset} ## print "unset" if variable is not set unset By using process substitution instead, it becomes available: $ while read perms links owner group size month day time file > do > printf "%10d %s\n" "$size" "$file" > totalsize=$(( ${totalsize:=0} + ${size:-0} )) > done < <(ls -l *) $ echo ${totalsize-unset} 12879 Parsing Options The options to a shell script, single characters preceded by a hyphen, can be parsed with the built-in command getopts.

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