how to learn perl

Interactive publishing network computer channel. A book tutorial for you on the Perl language is recommended. Includes Perl push, Perl Chomp, and Perl python content.perl language book One, "Perl Language Programming fourth edition (in the book) (Photocopy version)"

of the operands of a continuous operator is a constant, it is converted to an integer and matched with "$.Therefore, we can write code like this to output the first 10 lines of the file:CodeWhile (Print if 1 .. 10;}The last thing to note about "$." Is that there is only one "$." variable in a program. If you are reading data from multiple file handles, the "$." variable saves the current record number in the recently read file handle. If you want a more complex solution to this problem, you can

Introduction to Perl syntax 1.PERL variables 1.1.Perl Variable Classification 1.2.Perl variables 1.2.1 Scalar variable 1.2.2 Array Variables 1.2.3 Scalar and array variables 1.2.4 Associative arrays 2.PERL operator

for users, while the processing factory requires users to learn a certain design to be handy. The start point of the latter is higher, but after a certain level is reached, the next Linux user will obviously feel a high degree of freedom. The reason is that it is not built-in. Most of the operations that need to be completed in daily life should already have existing software. a small part of the cyclic operations are almost done by batch processing

can be arbitrary size, from empty hash (no key/value pair) to any size that your memory allows.The keys are unique, but values can be repeated. The value of a hash can be a number, a string, a undef, or a mixture of them, but the key is unique. Why Use Perl Hash You can think of a hash as a simple database, where you can have a piece of data under each key. If your task is about: "Query repeat", "unique", "cross-reference", "Query table", then hash

Perl ref Functions We all know that Perl has a reference concept: a group of data is actually a reference of another group of data. These references are called pointers. The first group of data stores the header address of the second group of data. For details about this part, refer to [original] learning notes for the Perl 24-hour Tutorial: reference and struct

expressions implement the same function. On the left is the @ A operation on the array, and on the right is the operation on the array pointed to by 'quot' $ Aref. They have the same effect on arrays. The 'quota' of the hash is exactly the same as the 'quota' of the array. % H % {$ href} a hashKeys % H keys % {$ href} get the key from the hash$ H {'red'} $ {$ href} {'red'} is a member in the hash.$ H {'red'} = 17 $ {$ href} {'red'} = 17 assign values to a memberNo matter what you want to do wit

Perl was first designed by Larry Wall), which was published in December 18, 1987. Perl uses the features of C, sed, awk, shell scripting, and many other programming languages. The most important feature is that it integrates the Regular Expression Function and a huge third-party code library CPAN. Many recruitment requirements are familiar with one of Perl Python

execution tool (you can also add a directory to the environment variable, so you do not need to add a directory to run it)Perl pass. pl will allow you to enter the password and generate a string to replace the string with the string. # The encrypted string's line "" is enough. The content of pass. pl is as follows:#! /Usr/bin/perl-wUse Digest: MD5 qw (md5_base64 );Print "Enter the string to be encrypted :"

File Operations for Perl learning notes This article mainly introduces the file operations of Perl learning notes. This article provides examples of opening files, reading files, and Writing File Code respectively. For more information, see Perl's file operations are similar to other languages, that is, open, read, and write operations.1. open the file ? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15