DOCSLIB.ORG

Programming Perl

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Programming Perl Programming Perl #!/usr/bin/perl −w use strict; $_=’ev al("seek\040D ATA,0, 0;");foreach(1..2) {<DATA>;}my @camel1hump;my$camel; my$Camel ;while( <DATA>){$_=sprintf("%−6 9s",$_);my@dromedary 1=split(//);if(defined($ _=<DATA>)){@camel1hum p=split(//);}while(@dromeda ry1){my$camel1hump=0 ;my$CAMEL=3;if(defined($_=shif t(@dromedary1 ))&&/\S/){$camel1hump+=1<<$CAMEL;} $CAMEL−−;if(d efined($_=shift(@dromedary1))&&/\S/){ $camel1hump+=1 <<$CAMEL;}$CAMEL−−;if(defined($_=shift( @camel1hump))&&/\S/){$camel1hump+=1<<$CAMEL;}$CAMEL−−;if( defined($_=shift(@camel1hump))&&/\S/){$camel1hump+=1<<$CAME L;;}$camel.=(split(//,"\040..m‘{/J\047\134}L^7FX"))[$camel1h ump];}$camel.="\n";}@camel1hump=split(/\n/,$camel);foreach(@ camel1hump){chomp;$Camel=$_;tr/LJF7\173\175‘\047/\061\062\063 45678/;tr/12345678/JL7F\175\173\047‘/;$_=reverse;print"$_\040 $Camel\n";}foreach(@camel1hump){chomp;$Camel=$_;y/LJF7\173\17 5‘\047/12345678/;tr/12345678/JL7F\175\173\047‘/;$_=reverse;p rint"\040$_$Camel\n";}#japh−Erudil’;;s;\s*;;g;;eval; eval ("seek\040DATA,0,0;");undef$/;$_=<DATA>;s$\s*$$g;( );;s ;^.*_;;;map{eval"print\"$_\"";}/.{4}/g; __DATA__ \124 \1 50\145\040\165\163\145\040\157\1 46\040\1 41\0 40\143\141 \155\145\1 54\040\1 51\155\ 141 \147\145\0 40\151\156 \040\141 \163\16 3\ 157\143\ 151\141\16 4\151\1 57\156 \040\167 \151\164\1 50\040\ 120\1 45\162\ 154\040\15 1\163\ 040\14 1\040\1 64\162\1 41\144 \145\ 155\14 1\162\ 153\04 0\157 \146\ 040\11 7\047\ 122\1 45\15 1\154\1 54\171 \040 \046\ 012\101\16 3\16 3\15 7\143\15 1\14 1\16 4\145\163 \054 \040 \111\156\14 3\056 \040\ 125\163\145\14 4\040\ 167\1 51\164\1 50\0 40\160\ 145\162 \155\151 \163\163 \151\1 57\156\056 Kirrily Robert Paul Fenwick Jacinta Richardson Programming Perl by Kirrily Robert, Paul Fenwick, and Jacinta Richardson Copyright © 1999-2000 Netizen Pty Ltd Copyright © 2000 Kirrily Robert Copyright © 2001 Obsidian Consulting Group Pty Ltd Copyright © 2001-2007 Paul Fenwick ([email protected]) Copyright © 2001-2007 Jacinta Richardson ([email protected]) Copyright © 2001-2007 Perl Training Australia Open Publications License 1.0 Cover artwork Copyright (c) 2000 by Stephen B. Jenkins. Used with permission. The use of a camel image with the topic of Perl is a trademark of O’Reilly & Associates, Inc. Used with permission. This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at http://www.opencontent.org/openpub/). Distribution of this work or derivative of this work in any standard (paper) book form is prohibited unless prior permission is obtained from the copyright holder. This document is a revised and edited copy of the Introduction to Perl and Intermediate Perl training notes originally created by Kirrily Robert and Netizen Pty Ltd. These revisions were made by Paul Fenwick and Jacinta Richardson. Copies of the original training manuals can be found at http://sourceforge.net/projects/spork This training manual is maintained by Perl Training Australia, and can be found at http://www.perltraining.com.au/notes.html This is version 1.13 of Perl Training Australia’s "Programming Perl" training manual. Table of Contents 1. About Perl Training Australia....................................................................................................... 1 Training....................................................................................................................................... 1 Consulting ................................................................................................................................... 1 Contact us.................................................................................................................................... 1 2. Introduction..................................................................................................................................... 3 Credits ......................................................................................................................................... 3 Course outline ............................................................................................................................. 3 Day 1 ................................................................................................................................. 3 Day 2 ................................................................................................................................. 3 Day 3 ................................................................................................................................. 3 Day 4 ................................................................................................................................. 3 Assumed knowledge ................................................................................................................... 4 Platform and version details........................................................................................................4 The course notes.......................................................................................................................... 4 Other materials............................................................................................................................ 5 3. What is Perl..................................................................................................................................... 7 In this chapter.............................................................................................................................. 7 Perl’s name and history............................................................................................................... 7 Typical uses of Perl ..................................................................................................................... 7 Text processing..................................................................................................................7 System administration tasks ..............................................................................................7 CGI and web programming...............................................................................................7 Database interaction ..........................................................................................................8 Other Internet programming..............................................................................................8 Less typical uses of Perl ....................................................................................................8 What is Perl like? ........................................................................................................................ 8 The Perl Philosophy.................................................................................................................... 9 There’s more than one way to do it ...................................................................................9 A correct Perl program......................................................................................................9 Three virtues of a programmer..........................................................................................9 Laziness....................................................................................................................9 Impatience................................................................................................................9 Hubris.......................................................................................................................9 Three more virtues...........................................................................................................10 Share and enjoy!..............................................................................................................10 Parts of Perl...............................................................................................................................10 The Perl interpreter..........................................................................................................10 Manuals/Documentation..................................................................................................10 Perl Modules....................................................................................................................11 Chapter summary ......................................................................................................................11 4. A brief guide to perldoc................................................................................................................13 Using perldoc............................................................................................................................13 Exercise ...........................................................................................................................13 Language features and tutorials ................................................................................................13 Looking up functions ................................................................................................................13 Looking up modules..................................................................................................................14 Perl Training Australia (http://perltraining.com.au/) iii 5. Creating and running a Perl program........................................................................................15
Load more

Recommended publications
  • Learning to Program in Perl
    Learning to Program in Perl by Graham J Ellis Languages of the Web Learning to Program in Perl version 1.7 Written by Graham Ellis [email protected] Design by Lisa Ellis Well House Consultants, Ltd. 404, The Spa, Melksham, Wiltshire SN12 6QL England +44 (0) 1225 708 225 (phone) +44 (0) 1225 707 126 (fax) Find us on the World Wide Web at: http://www.wellho.net Or contact us at: [email protected] Copyright © 2003 by Well House Consultants, Ltd. Printed in Great Britain. Printing History May 1999 1.0 First Edition February 2000 1.1 Minor additions June 2000 1.2 Compliation of modules October 2000 1.3 Name change, revisions April 2002 1.4 Added modules September 2002 1.5 Added modules January 2003 1.6 Updated modules February 2003 1.7 Updated modules This manual was printed on 21 May 2003. Notice of Rights All rights reserved. No part of this manual, including interior design, may be reproduced or translated into any language in any form, or transmitted in any form or by any means electronic, mechanical, photocopying, recording or otherwise, without prior written permission of Well House Consultants except in the case of brief quotations embodied in critical articles and reviews. For more information on getting permission for reprints and excerpts, contact Graham Ellis at Well House Consultants. This manual is subject to the condition that it shall not, by way of trade or otherwise, be lent, sold, hired out or otherwise circulated without the publisher's prior consent, incomplete nor in any form of binding or cover other than in which it is published and without a similar condition including this condition being imposed on the subsequent receiver.
    [Show full text]
  • How to Secure Your Web Site Picked up SQL Injection and Cross-Site Scripting As Sample Cases of Failure Because These Two Are the Two Most Reported Vulnerabilities
    How to Secure your Website rd 3 Edition Approaches to Improve Web Application and Web Site Security June 2008 IT SECURITY CENTER (ISEC) INFORMATION-TECHNOLOGY PROMOTION AGENCY, JAPAN This document is a translation of the original Japanese edition. Please be advises that most of the references referred in this book are offered in Japanese only. Both English and Japanese edition are available for download at: http://www.ipa.go.jp/security/english/third.html (English web page) http://www.ipa.go.jp/security/vuln/websecurity.html (Japanese web page) Translated by Hiroko Okashita (IPA), June 11 2008 Contents Contents ......................................................................................................................................... 1 Preface ........................................................................................................................................... 2 Organization of This Book ........................................................................................................... 3 Intended Reader ......................................................................................................................... 3 Fixing Vulnerabilities – Fundamental Solution and Mitigation Measure - .................................... 3 1. Web Application Security Implementation ............................................................................... 5 1.1 SQL Injection .................................................................................................................... 6 1.2
    [Show full text]
  • Practical Perl Tools: Scratch the Webapp Itch With
    last tIme, we had the pleasure oF exploring the basics of a Web applica- DaviD n. BLank-EdeLman tion framework called CGI::Application (CGI::App). I appreciate this particular pack- age because it hits a certain sweet spot in practical Perl tools: terms of its complexity/learning curve and scratch the webapp itch with power. In this column we’ll finish up our exploration by looking at a few of the more CGI::Application, part 2 powerful extensions to the framework that David N. Blank-Edelman is the director of can really give it some oomph. technology at the Northeastern University College of Computer and Information Sci- ence and the author of the O’Reilly book Quick review Automating System Administration with Perl (the second edition of the Otter book), Let’s do a really quick review of how CGI::App available at purveyors of fine dead trees works, so that we can build on what we’ve learned everywhere. He has spent the past 24+ years as a system/network administrator in large so far. CGI::App is predicated on the notion of “run multi-platform environments, including modes.” When you are first starting out, it is easi- Brandeis University, Cambridge Technology est to map “run mode” to “Web page” in your head. Group, and the MIT Media Laboratory. He was the program chair of the LISA ’05 confer- You write a piece of code (i.e., a subroutine) that ence and one of the LISA ’06 Invited Talks will be responsible for producing the HTML for co-chairs.
    [Show full text]
  • The Machine That Builds Itself: How the Strengths of Lisp Family
    Khomtchouk et al. OPINION NOTE The Machine that Builds Itself: How the Strengths of Lisp Family Languages Facilitate Building Complex and Flexible Bioinformatic Models Bohdan B. Khomtchouk1*, Edmund Weitz2 and Claes Wahlestedt1 *Correspondence: [email protected] Abstract 1Center for Therapeutic Innovation and Department of We address the need for expanding the presence of the Lisp family of Psychiatry and Behavioral programming languages in bioinformatics and computational biology research. Sciences, University of Miami Languages of this family, like Common Lisp, Scheme, or Clojure, facilitate the Miller School of Medicine, 1120 NW 14th ST, Miami, FL, USA creation of powerful and flexible software models that are required for complex 33136 and rapidly evolving domains like biology. We will point out several important key Full list of author information is features that distinguish languages of the Lisp family from other programming available at the end of the article languages and we will explain how these features can aid researchers in becoming more productive and creating better code. We will also show how these features make these languages ideal tools for artificial intelligence and machine learning applications. We will specifically stress the advantages of domain-specific languages (DSL): languages which are specialized to a particular area and thus not only facilitate easier research problem formulation, but also aid in the establishment of standards and best programming practices as applied to the specific research field at hand. DSLs are particularly easy to build in Common Lisp, the most comprehensive Lisp dialect, which is commonly referred to as the “programmable programming language.” We are convinced that Lisp grants programmers unprecedented power to build increasingly sophisticated artificial intelligence systems that may ultimately transform machine learning and AI research in bioinformatics and computational biology.
    [Show full text]
  • [PDF] Beginning Raku
    Beginning Raku Arne Sommer Version 1.00, 22.12.2019 Table of Contents Introduction. 1 The Little Print . 1 Reading Tips . 2 Content . 3 1. About Raku. 5 1.1. Rakudo. 5 1.2. Running Raku in the browser . 6 1.3. REPL. 6 1.4. One Liners . 8 1.5. Running Programs . 9 1.6. Error messages . 9 1.7. use v6. 10 1.8. Documentation . 10 1.9. More Information. 13 1.10. Speed . 13 2. Variables, Operators, Values and Procedures. 15 2.1. Output with say and print . 15 2.2. Variables . 15 2.3. Comments. 17 2.4. Non-destructive operators . 18 2.5. Numerical Operators . 19 2.6. Operator Precedence . 20 2.7. Values . 22 2.8. Variable Names . 24 2.9. constant. 26 2.10. Sigilless variables . 26 2.11. True and False. 27 2.12. // . 29 3. The Type System. 31 3.1. Strong Typing . 31 3.2. ^mro (Method Resolution Order) . 33 3.3. Everything is an Object . 34 3.4. Special Values . 36 3.5. :D (Defined Adverb) . 38 3.6. Type Conversion . 39 3.7. Comparison Operators . 42 4. Control Flow . 47 4.1. Blocks. 47 4.2. Ranges (A Short Introduction). 47 4.3. loop . 48 4.4. for . 49 4.5. Infinite Loops. 53 4.6. while . 53 4.7. until . 54 4.8. repeat while . 55 4.9. repeat until. 55 4.10. Loop Summary . 56 4.11. if . ..
    [Show full text]
  • Files: Cpan/Test-Harness/* Copyright: Copyright (C) 2007-2011
    Files: cpan/Test-Harness/* Copyright: Copyright (c) 2007-2011, Andy Armstrong <[email protected]>. All rights reserved. License: GPL-1+ or Artistic Comment: This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. Files: cpan/Test-Harness/lib/TAP/Parser.pm Copyright: Copyright 2006-2008 Curtis "Ovid" Poe, all rights reserved. License: GPL-1+ or Artistic Comment: This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. Files: cpan/Test-Harness/lib/TAP/Parser/YAMLish/Reader.pm Copyright: Copyright 2007-2011 Andy Armstrong. Portions copyright 2006-2008 Adam Kennedy. License: GPL-1+ or Artistic Comment: This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. Files: cpan/Test-Simple/* Copyright: Copyright 2001-2008 by Michael G Schwern <[email protected]>. License: GPL-1+ or Artistic Comment: This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. Files: cpan/Test-Simple/lib/Test/Builder.pm Copyright: Copyright 2002-2008 by chromatic <[email protected]> and Michael G Schwern E<[email protected]>. License: GPL-1+ or Artistic 801 Comment: This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. Files: cpan/Test-Simple/lib/Test/Builder/Tester/Color.pm Copyright: Copyright Mark Fowler <[email protected]> 2002. License: GPL-1+ or Artistic Comment: This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
    [Show full text]
  • INTRODUCTION to PL/1 PL/I Is a Structured Language to Develop Systems and Applications Programs (Both Business and Scientific)
    INTRODUCTION TO PL/1 PL/I is a structured language to develop systems and applications programs (both business and scientific). Significant features : v Allows Free format v Regards a program as a continuous stream of data v Supports subprogram and functions v Uses defaults 1 Created by Sanjay Sinha Building blocks of PL/I : v Made up of a series of subprograms and called Procedure v Program is structured into a MAIN program and subprograms. v Subprograms include subroutine and functions. Every PL/I program consists of : v At least one Procedure v Blocks v Group 2 Created by Sanjay Sinha v There must be one and only one MAIN procedure to every program, the MAIN procedure statement consists of : v Label v The statement ‘PROCEDURE OPTIONS (MAIN)’ v A semicolon to mark the end of the statement. Coding a Program : 1. Comment line(s) begins with /* and ends with */. Although comments may be embedded within a PL/I statements , but it is recommended to keep the embedded comments minimum. 3 Created by Sanjay Sinha 2. The first PL/I statement in the program is the PROCEDURE statement : AVERAGE : PROC[EDURE] OPTIONS(MAIN); AVERAGE -- it is the name of the program(label) and compulsory and marks the beginning of a program. OPTIONS(MAIN) -- compulsory for main programs and if not specified , then the program is a subroutine. A PL/I program is compiled by PL/I compiler and converted into the binary , Object program file for link editing . 4 Created by Sanjay Sinha Advantages of PL/I are : 1. Better integration of sets of programs covering several applications.
    [Show full text]
  • Assignment 4 Computer Science 235 Due Start of Class, October 4, 2005
    Assignment 4 Computer Science 235 Due Start of Class, October 4, 2005 This assignment is intended as an introduction to OCAML programming. As always start early and stop by if you have any questions. Exercise 4.1. Twenty higher-order OCaml functions are listed below. For each function, write down the type that would be automatically reconstructed for it. For example, consider the following OCaml length function: let length xs = match xs with [] -> 0 | (_::xs') = 1 + (length xs') The type of this OCaml function is: 'a list -> int Note: You can check your answers by typing them into the OCaml interpreter. But please write down the answers first before you check them --- otherwise you will not learn anything! let id x = x let compose f g x = (f (g x)) let rec repeated n f = if (n = 0) then id else compose f (repeated (n - 1) f) let uncurry f (a,b) = (f a b) let curry f a b = f(a,b) let churchPair x y f = f x y let rec generate seed next isDone = if (isDone seed) then [] else seed :: (generate (next seed) next isDone) let rec map f xs = match xs with [] -> [] Assignment 4 Page 2 Computer Science 235 | (x::xs') -> (f x) :: (map f xs') let rec filter pred xs = match xs with [] -> [] | (x::xs') -> if (pred x) then x::(filter pred xs') else filter pred xs' let product fs xs = map (fun f -> map (fun x -> (f x)) xs) fs let rec zip pair = match pair with ([], _) -> [] | (_, []) -> [] | (x::xs', y::ys') -> (x,y)::(zip(xs',ys')) let rec unzip xys = match xys with [] -> ([], []) | ((x,y)::xys') -> let (xs,ys) = unzip xys' in (x::xs, y::ys) let rec
    [Show full text]
  • Object Oriented Programming in Java Object Oriented
    Object Oriented Programming in Java Introduction Object Oriented Programming in Java Introduction to Computer Science II I Java is Object-Oriented I Not pure object oriented Christopher M. Bourke I Differs from other languages in how it achieves and implements OOP [email protected] functionality I OOP style programming requires practice Objects in Java Objects in Java Java is a class-based OOP language Definition Contrast with proto-type based OOP languages A class is a construct that is used as a blueprint to create instances of I Example: JavaScript itself. I No classes, only instances (of objects) I Constructed from nothing (ex-nihilo) I Objects are concepts; classes are Java’s realization of that concept I Inheritance through cloning of original prototype object I Classes are a definition of all objects of a specific type (instances) I Interface is build-able, mutable at runtime I Classes provide an explicit blueprint of its members and their visibility I Instances of a class must be explicitly created Objects in Java Objects in JavaI Paradigm: Singly-Rooted Hierarchy Object methods 1 //ignore: 2 protected Object clone(); 3 protected void finalize(); I All classes are subclasses of Object 4 Class<? extends Object> getClass(); 5 I Object is a java object, not an OOP object 6 //multithreaded applications: I Makes garbage collection easier 7 public void notify(); 8 public void notifyAll(); I All instances have a type and that type can be determined 9 public void wait(); I Provides a common, universal minimum interface for objects 10 public
    [Show full text]
  • A Block Design for Introductory Functional Programming in Haskell
    A Block Design for Introductory Functional Programming in Haskell Matthew Poole School of Computing University of Portsmouth, UK [email protected] Abstract—This paper describes the visual design of blocks for the learner, and to avoid syntax and type-based errors entirely editing code in the functional language Haskell. The aim of the through blocks-based program construction. proposed blocks-based environment is to support students’ initial steps in learning functional programming. Expression blocks and There exists some recent work in representing functional slots are shaped to ensure constructed code is both syntactically types within blocks-based environments. TypeBlocks [9] in- correct and preserves conventional use of whitespace. The design cludes three basic type connector shapes (for lists, tuples aims to help students learn Haskell’s sophisticated type system and functions) which can be combined in any way and to which is often regarded as challenging for novice functional any depth. The prototype blocks editor for Bootstrap [10], programmers. Types are represented using text, color and shape, [11] represents each of the five types of a simple functional and empty slots indicate valid argument types in order to ensure language using a different color, with a neutral color (gray) that constructed code is well-typed. used for polymorphic blocks; gray blocks change color once their type has been determined during program construction. I. INTRODUCTION Some functional features have also been added to Snap! [12] Blocks-based environments such as Scratch [1] and Snap! and to a modified version of App Inventor [13]. [2] offer several advantages over traditional text-based lan- This paper is structured as follows.
    [Show full text]
  • "This Book Was a Joy to Read. It Covered All Sorts of Techniques for Debugging, Including 'Defensive' Paradigms That Will Eliminate Bugs in the First Place
    Perl Debugged By Peter Scott, Ed Wright Publisher : Addison Wesley Pub Date : March 01, 2001 ISBN : 0-201-70054-9 Table of • Pages : 288 Contents "This book was a joy to read. It covered all sorts of techniques for debugging, including 'defensive' paradigms that will eliminate bugs in the first place. As coach of the USA Programming Team, I find the most difficult thing to teach is debugging. This is the first text I've even heard of that attacks the problem. It does a fine job. Please encourage these guys to write more." -Rob Kolstad Perl Debugged provides the expertise and solutions developers require for coding better, faster, and more reliably in Perl. Focusing on debugging, the most vexing aspect of programming in Perl, this example-rich reference and how-to guide minimizes development, troubleshooting, and maintenance time resulting in the creation of elegant and error-free Perl code. Designed for the novice to intermediate software developer, Perl Debugged will save the programmer time and frustration in debugging Perl programs. Based on the authors' extensive experience with the language, this book guides developers through the entire programming process, tackling the benefits, plights, and pitfalls of Perl programming. Beginning with a guided tour of the Perl documentation, the book progresses to debugging, testing, and performance issues, and also devotes a chapter to CGI programming in Perl. Throughout the book, the authors espouse defensible paradigms for improving the accuracy and performance of Perl code. In addition, Perl Debugged includes Scott and Wright's "Perls of Wisdom" which summarize key ideas from each of the chapters, and an appendix containing a comprehensive listing of Perl debugger commands.
    [Show full text]
  • UNIX Essentials (Hands-On)
    UNIX essentials (hands-on) • the directory tree • running programs • the shell (using the T-shell) → command line processing → special characters → command types → shell variables → environment variables → wildcards → shell scripts → shell commands → pipes and redirection • OS commands • special files 1 • The Directory Tree → directories contain files and/or directories → / : means either the root directory, or a directory separator • consider /home/afniuser/AFNI_data3 afniuser/suma_demo → an "absolute" pathname begins with '/', a "relative" pathname does not • a relative pathname depends on where you start from • in the directories above, note which is a relative pathname → every directory has a parent directory • the relative pathname for the parent directory is '..' • the relative pathname for the current directory is '.' • consider './run_this_script' and '/bin/ls ../../suma_demo' → many commands can be used to return to the home directory (of "afniuser") • cd, cd ~, cd ~afniuser, cd $HOME, cd /home/afniuser • note the 2 special characters, '~' and '$' → while you work, keep your location within the directory tree in mind 2 → class work: • open a terminal window • commands: cd, pwd, ls, ls -al • use the "cd" command to go to the given directories e.g. for directory /usr/bin, use the command: cd /usr/bin once there, use the commands "pwd", "ls", and "ls -al" note that you can always return to the home directory via: cd / home/afniuser AFNI_data3 .. AFNI_data3/afni /usr/bin ~/abin ../../afniuser/../afniuser • first example (starting with the '/'directory), use the commands: cd / pwd ls ls -al 3 • Running Programs → a program is something that gets "executed", or "run" → the first element of a command line is generally a program (followed by a space) → most shells are case sensitive when processing a command → command examples: /bin/ls $HOME ~/AFNI_data3 count -digits 2 1 10 → script: an interpreted program (interpreted by another program) • e.g.
    [Show full text]