Teach Yourself Perl 5 in 21 days                                       David Till                                Table of ...
q   Interpretive Languages Versus Compiled Languages   q   Summary   q   Q&A   q   Workshop           r Quiz           r E...
q   Floating-Point Scalar Values          r Floating-Point Arithmetic and Round-Off Error  q   Using Octal and Hexadecimal...
r  The Autodecrement Operator          r Using Autoincrement With Strings   q   The String Concatenation and Repetition Op...
r Overlapping Array Slices          r Using the Array-Slice Notation as a Shorthand   q   Reading an Array from the Standa...
q   Reading from a Sequence of Files           r Reading into an Array Variable   q   Using Command-Line Arguments as Valu...
r  Using Pattern-Sequence Variables in Substitutions          r Options for the Substitution Operator          r Evaluatin...
r  Using next and redo with Labels   q   The continue Block   q   The goto Statement   q   Summary   q   Q&A   q   Worksho...
q   Adding Elements to an Associative Array  q   Creating Associative Arrays  q   Copying Associative Arrays from Array Va...
r   ExercisesDay 12 Working with the File System   q   File Input and Output Functions           r Basic Input and Output ...
r  The sin and cos Functions           r The atan2 Function           r The sqrt Function           r The exp Function    ...
r  The unpack Function and uuencode   q   The vec Function   q   The defined Function   q   The undef Function   q   Array...
r The getgrid Function       r The getnetent Function       r The getnetbyaddr Function       r The getnetbyname Function ...
r The msgrcv Function         r The msgctl Function         r The shmget Function         r The shmwrite Function         ...
q   Miscellaneous Options          r The -u Option          r The -U Option          r The -S Option          r The -D Opt...
r  Controlling Debugging: $^P           r The Program Start Time: $^T           r Suppressing Warning Messages: $^W       ...
q   References and Arrays   q   Multidimensional Arrays   q   References to Subroutines           r Using Subroutine Templ...
q   The require Function          r The require Function and Subroutine Libraries          r Using require to Specify a Pe...
q   Entering and Exiting the Perl Debugger        r Entering the Debugger        r Exiting the Debuggerq   Listing Your Pr...
r   QuizWeek 3 Week 3 in ReviewAppendix A Answers  q   Answers for Day 1, "Getting Started"         r Quiz         r Exerc...
r  Exercises    q   Answers for Day 13, "Process, String, and Mathematical Functions"           r Quiz           r Exercis...
system, or transmitted by any means, electronic, mechanical, photocopying, recording, orotherwise, without written permiss...
I would like to thank the following people for their help:    q   David Macklem at Sietec Open Systems for allowing me to ...
Who Should Read This Book?No previous programming experience is required for you to learn everything you need toknow about...
Dont try to understand this definition yet!DO/DONT boxes present the dos and donts for a particular task or feature. Here ...
It is a good idea to use all uppercase letters for your               file variable names. This makes it easier to disting...
Line 1 is the header comment. Lines 2 and 3 are comments, not executable linesof code. Line 4 reads a line of input. Line ...
Day 3, "Understanding Scalar Values," teaches you about integers,      floating-point numbers, and character strings. It a...
Day 14, "Scalar-Conversion and List-Manipulation Functions," describes      the library functions that convert values from...
Week                                                                            1Week at a Glance                         ...
numbers, and character strings. It also shows you that all three are interchangeable inPerl.Day 4, "More Operators," tells...
Chapter 1Getting Started                                  CONTENTS   q   What Is Perl?   q   How Do I Find Perl?          ...
What Is Perl?Perl is an acronym, short for Practical Extraction and Report Language. It was designedby Larry Wall as a too...
If you do not find Perl in this way, talk to your system administrator and ask whethershe or he has Perl running somewhere...
230-230 Guest login ok, access restrictions apply.ftp> cd pub/gnu250-If you have problems downloading and are seeing "Acce...
The commands entered in this session are explained in the following steps. If some ofthese steps are not familiar to you, ...
subdirectories where appropriate; this ensures that the Perl source files are      organized in a logical way.   4. Using ...
ftp.funet.fi          Internet address 128.214.248.6                                    Directory                         ...
$program1_1      This is my line of input.      This is my line of input.      $ Line 1 is the header comment. Line 2 read...
If Something Goes WrongIf Listing 1.1 is stored in the file program1_1 and run according to the preceding steps,the progra...
Lets break this line down, one part at a time:    q   The first character in the line, the # character, is the Perl commen...
# this entire line is a commentYou can-and should-use comments to make your programs easier to understand. Listing1.2 is t...
This is a line of input.      This is a line of input.      $The behavior of the program in Listing 1.2 is identical to th...
does, you need to know what a Perl statement is and what its components are.Statements and TokensThe line of code you have...
As youve seen already, the statement      $inputline = <STDIN>;consists of four tokens: $inputline, =, <STDIN>, and ;. The...
destroyed unless it has been copied somewhere else.          NOTE                 If there are more lines of input than th...
Function Invocations and ArgumentsWhen a reference to print appears in a Perl program, the Perl interpreter calls, orinvok...
Listing 1.3. A program containing an error.      1: #!/usr/local/bin/perl      2: $inputline = <STDIN>      3: print ($inp...
cascading.                 Its usually pretty easy to spot error cascading. If the                 interpreter is telling ...
everything you type from your keyboard, and the standard output file storeseverything your Perl program sends to your scre...
A:        This encourages the dissemination of computer knowledge and capabilities.          It works like this: You can g...
print ($inputline)5. BUG BUSTER: What is wrong with the following program?  #!/usr/local/bin/perl  $inputline = <STDIN>;  ...
Chapter 2Basic Operators and Control Flow                                    CONTENTS   q   Storing in Scalar Variables As...
q   More about scalar variables and how to assign values to them    q   The basic arithmetic operators and how they work w...
$a_new_variableThese, however, are not legal scalar variable names:      variable          # the $ character is missing   ...
$inputline = <STDIN>;Remember that this statement tells Perl that the line of text read from the standardinput file, repre...
In Perl, enclosed text such as John Q Hacker is known as a character string, and thesurrounding " characters are an exampl...
$var = 17 + 5 - 3;You can use the value of a variable in an arithmetic operation, as follows:      $var1 = 11;      $var2 ...
Example of Miles-to-Kilometers ConversionTo see how arithmetic operators work, look at Listing 2.1, which performs a simpl...
$         Line 3 of this program asks for a distance to convert. To do this, it prints thefollowing text on your screen   ...
Different machines handle floating-point numbers                (numbers containing a decimal point) in different ways.   ...
$originaldist = <STDIN>;      chop ($originaldist);ExpressionsNow that you know a little more about operators, operands, a...
to $var. Heres what the Perl interpreter is doing, more formally, when it evaluates thisexpression ($var = 4 * 5 + 3):   1...
are used in conditional statements, which youll see                  later today.Assignments and ExpressionsThe assignment...
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