tcl vs perl

Perl Object-Oriented Programming For details, see damian Conway. Directory-----------------------------------------------------CollationPrefaceThank youOnline 1 What You Need To Know first (Object-Oriented)1.1 object-oriented nature.1.2 Other object-oriented concepts.1.3 terms: Some (many) words.1.4 where can I get more.1.5 summary. 2 What You Need To Know (Perl advanced)2.1

Tidy up the notes you put on Hi.baidu years ago!Perl concise Programming, "Perl Language Primer (Fifth Edition)" Reading notes 20110316!The book was bought very early, simply turned over and dropped!Recently bought an ipad, a good reading experience, used to read books, feel the book can look in!You can't look it over and tidy up your reading notes!Perl's program can be so concise!!!Sub division {$_[0]/$_[1

Method 1: Maven is used to build an application in the past two days, there are more than 700 pom. XML file, even more depressing is in many pom. the URL of the resource library is specified separately in the XML file. I need to uniformly specify the URLs of these resource libraries to the local central nexus library. it is not practical to manually change the file configurations one by one, So Google will find a good way to replace the file content in batches. The command structure is as

Perl reads multiple lines of text at a time. perl reads multiple lines of text at a time. When processing text, we often encounter the following situation: we need to compare the two lines of text and then output them selectively. By default, only one row can be read at a time in the while ( There is a text like this: A 1 2 3 4A 5 6 7 8A 6 7 8 9A 7 8 9 11A 7 8 9 12A 13 12 14 15A 18 14 16 17A 2 3 4 65 The r

Release date:Updated on: 2012-03-13 Affected Systems:Debian Linux 6.0 xCpan yaml-LibYAML 0.38Cpan yaml-LibYAML 0.33-1Description:--------------------------------------------------------------------------------Bugtraq id: 52381Cve id: CVE-2012-1152 Perl is a high-level, general, literal, and dynamic programming language. The Perl YAML-LibYAML module has multiple format string vulnerabilities. Attackers ca

, commaIs the function of a connection: $a +=1, $b = $a; ==> $a +=1; $b = $a;No eggs.Eight, conditional operatorsThree operands: evaluates the conditional expression first, and executes the question mark (? The following operation, which executes a colon when false (:) After the operation.$result = $var = = 0? 14:7 #一般只用于简单的条件 too complex is not as good as if statement looks intuitiveIx. Precedence of operators (precedence)Self-increment self-reduction highest, single operand higher than multi-o

Preface Sometimes there are these requirements: 1. count the number of rows of a file 2. Calculate the number of valid lines of a source code. Exclude empty and comment rows 3. Unify the quantity and number of files in a directory Many languages can achieve these needs, but using Perl should be a good choice. Number of lines reading files It's easy to use Perl to read the total number of lines in a file (

When you're learning Perl, it's hard to care if Perl is obsolete. Is this version already obsolete? For the previous question, it may be useful to refer to the February 2012 Tiobe report, according to which we can see that Perl has been a downward trend since 1997, but we can also see that Perl has been in the top 10

1.PERL4 Kinds of variablesScalar: $ pure variable, scalarArray: @Hash:%File: Uppercase2. Variable composition1. Naming rules case sensitive, alphanumeric underline ...2. No keywords, $+ other, but can not conflict with built-in variables.3. The name length is infinite.3. In pure variables: integer, float, character, string,Integer variable1. You can use _ to divide character numbers2.012 is octal 103.0X1F is 16 binaryFloating-point variable1.11.42.-0.33..3can represent a 15-bit valid number, tru

1. Module source: Pack and download from CPAN together with the Perl release version 2. Read the module documentation: perldoc CGI 3. Installation Module Makemaker mode: Specify the installation directory: Module: Build mode: CPAN method: 4. File: basename Module 5. Select only some functions of the module. Import the reference list. 10. Do not introduce any function Use the full name: 11. File: spec Module 12. cgi.

Interactive programs usually require users to manually complete some operations, which often becomes an obstacle in system management automation and test automation. The least CT language that appeared on Unix can be used to interact with command line programs such as passwd, ssh, telnet, and ftp, freeing users from these manual operations. As an extension of the Tcl language, objective CT was originally compiled by

Practical Extraction and Report Language Perl was originally designed by Larry Wall in December 18, 1987. Perl uses the features of C, sed, awk, shell scripting, and many other programming languages. Perl is generally called the Practical Extraction and report language, although it is sometimes called the pathologicallyeclectic rubbish Lister ). It is the term,

Which platforms have Perl on? Where are we going to find them? The standard release of Perl (maintained by the Perl Development Group) is distributed only in the original code form. You can obtain it at http://www.perl.com/cpan/src/latest.tar.gz. The format of this file is the POSIX tar filing cabinet, which is then compressed in gzip format. This source code ca

Enable Perl before compiling Vim; Use the Perl interface ** Perl-using **: Perl **: Pe *: PE [RL]{cmd}Run the Perl Command{cmd}. The current package is "Main ". : PE [RL] {endpattern}{script}{endpattern}Execute the Perl script{s

I. Data Types(Data type): Perl has four data types: Scalar (variable), Scalar Array (Array), Hash Array (Hash), and References (pointer ), it seems to be rare, but it is more than enough to use it. Especially when writing Perl programs, you do not need to declare variables in advance. This is very convenient for those who are new to programming languages. However, in order to facilitate program debugging a

one. DataType (data type ): Perl's data types are roughly four: Scalar (variables), Scalar Array (array), hash array (hash), References (pointer), but they seem to be small but more than sufficient. In particular, you can write a Perl program without the prior declaration of variables, this is very convenient to learn the language of the program, but in order to later debugging and maintenance convenience, I suggest you or form the habit of declaring

How to Use eclipse to debug a Perl application before 11:30:36 This tutorial will introduce the debugging functions provided by the eclipse epic plug-in. This plug-in provides a rich debugging environment that can be used in the epic Perl development environment and integrated with this development environment. This tutorial assumes that you understand the eclipse environment and have experience using

The concept of the Perl method in the Perl language do you know, here's a quick introduction to Perl's perl approach as a Perl subroutine, or a commonly called member function. Perl method A brief introduction of Perl method

Reference Common Perl Command Line options Common unix Commands: perl implements sed awk tr nl Perl, sed, awk, tr, grep, nl, and other common commandsSed Task Sed Perl Replace12WithTwelve sed 's/12/twelve/g' perl -pe 's/12/twelve/g' Re

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)"