Mac os x perl tutorial

Effective Perl Programming – write better, more idiomatic Perl
Contents:
  1. Getting Started with Perl on Mac OS X
  2. Upgrading perl on Linux or OSX - installing perl using perlbrew without being root
  3. Installing Perl on Linux/Unix
  4. Installing Komodo for Mac OS X

If you are having trouble, post your issue to the Circos Google Group and include all files and detailed error logs.


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Please do not email me directly unless it is urgent—you are much more likely to receive a timely reply from the group. Don't know what question to ask? If you're still stuck, post your questions to the Circos group. Need to install modules? Having trouble with libgd and GD? There are some! Need to run Bash shell batch files in Windows? Stumped by an error? A good strategy is to Google the error message e. Want to learn more about Perl?

This special line must be at the beginning of your program and must starts from! The semicolon at the end of the line tells the perl interpreter that the instruction is finished. You must put a semicolon at the end of every instruction in Perl code. Note the quotation mark ". It's necessary for print instruction.

Save the above script as firstprog.

Getting Started with Perl on Mac OS X

To execute, write:. If you use perl modules, you do not have to rewrite the codes to perform that same operation. Perl can make use of such external libraries of codes. One of the best libraries is the CPAN. It stands for Comprehensive Perl Archive Network and contains a vast amount of Perl modules for you to use. It is a community or network of a large number of developers who contribute such modules.

Most Perl modules are written in Perl, some use XS they are written in C so require a C compiler it's easy to get this setup - don't panic. Modules may have dependencies on other modules almost always on CPAN and cannot be installed without them or without a specific version of them. It is worth thoroughly reading the documentation for the options below. Install cpanminus a script to get, unpack, build and install modules from CPAN to make installing other modules easier you'll thank us later.

To Install App-cpanminus perl modules, in the command line type: cpan App::cpanminus cpan App::cpanminus Make sure you have internet connection while perl modules are being downloaded and installed. Perl Variable Now, we'll talk about variables. You can imagine variable like kind of container which holds one or more values. Once defined, the name of variable remains the same, but the value or values change over and over again.

There are 3 Types of variables: The easiest ones are scalars, and this is ours today subject Scalar Variable This type of variable holds a single value. Its name begins with a dollar sign and a Perl identifier it's the name of our variable. Naming Convention If you are familiar with other programming languages, then you would know that there are certain rules about naming variables. Similarly, Perl has three rules for naming scalars.

Upgrading perl on Linux or OSX - installing perl using perlbrew without being root

Like PHP. Underscore character is also allowed. Use underscore to split the variable names into two words. Scalars can be read from devices, and we can use it to our programs. Two Types of Scalar Data Types Numbers Strings Numbers: In this type of scalar data we could specify: integers, simply it's whole numbers, like 2, 0, floating-point numbers, it's real numbers, like 3. For example, if you write 2 in your programs, Perl will see it like 2.

But believe me, this is the most common type of scalars.

Why use Perl?

They're everywhere. Floating-point literals: It consists of digits, optionally minus, decimal point and exponent.

Installing Perl on Linux/Unix

Perl Examples: 3. Allow me to show you Octal, Hexadecimal and Binary representation. A short table presents all important information about this weird styles: Representation Base Proceeded by Octal 8 0 zero Hexadecimal 16 0x Binary 2 0b Perl Examples: ; in decimal notation ; in octal notation 0xff; in hexadecimal notation 0b; in binary notation All of these values for Perl means the same.

Perl doesn't store the values in the same format. It will internally convert these hexadecimal, binary, octal to decimal values. The assignment is the most common operation on a scalar, and it's very simple.


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  • Perl uses for that equal sign. It takes a value of the expression from the right side and puts this value to our variable. The maximum length of a string in Perl depends upon the amount of memory the computer has. There is no limit to the size of the string, any amount of characters, symbols, or words can make up your strings. The shortest string has no characters.

    The longest can fill all of the system memory. Perl also permits you to add any 8-bit or bit character set aka. Perl has also added support for Unicode UTF Like numbers there are two different types of strings: Single quotes string literals Double quotes string literals Single-quoted string literals Single quotation marks are used to enclose data you want to be taken literally. A short example and everything should be clear: Perl Examples:! That means that escaped characters and variables aren't simply literally inserted into later operations, but are evaluated on the spot. Escape characters can be used to insert newlines, tabs, etc.

    On the other hand, you can use double-quotes to interpolate slices of both arrays and hashes. Yes, they are! But don't worry- just a few. Perl gets our string from the right side of the equal sign and puts this string to a variable. There isn't class of variables. String Concatenation period : The concatenation operator ". If the string contains quotes, carriage returns, backslashes, all these special characters need to be escaped with a backslash. Perl ' ' variable Examples:! In the end… Conversion Between Numbers and Strings: As you know, Perl automatically converts between numbers to string as needed.

    How does Perl know, what we need right now? This is simple- everything depends on the operator we'll talk about operators later, now, just accept there are a lot of operators, different for numbers and strings If an operator expects a number, Perl will use the value as a number. If an operator expects a string, Perl will use the value as a string. In other words- you don't need to worry about this kind of conversion.

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    Installing Komodo for Mac OS X

    Scope of a variable — Access Modifiers We can declare a scalar in anywhere in the program. But you need to specify an access modifier There are 3 types of modifiers my local our My: Using this you can declare any variable which is specific within the block. The variable, which is declared outside the block will be accessible to if block but the variable which was declared inside if block won't be accessible to the outer program.

    Let's see how this works with an example. Our: Once a variable is declared with access modifier "our" it can be used across the entire package.

    Installing ActivePerl on Windows and OS X

    Suppose, you have Perl module or a package test. This variable can be accessed in any scripts which will use that package. If you are serious about programming in Perl, you should begin your program with!