perl create directory if not exists

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Guide to Perl operators in Perl syntax

Introduction to Perl Operators 1. Perl Operators 1.1 Arithmetic Operators Perl is similar to C in both variables and data examples, but its operators and C are almost the same, except for C's example conversion operator type, pointer Reference

Use of Perl (), require (), do (),%inc and @INC

transferred from: http://perl.apache.org/docs/general/perl_reference/perl_reference.html Use (), require (), do (),%inc and @INC explained The @INC array @INC is a special Perl variable which is the equivalent of the shell ' s PATH variable.

Perl use (), require (), Do (), % INC and @ INC

From: http://perl.apache.org/docs/general/perl_reference/perl_reference.html Use (), require (), Do (), % INC and @ INC explained   The @ INC Array @ INCIs a special Perl variable which is the equivalent of the shell'sPathVariable.

[Perl learning] learning notes (continuously updated)

  Author: gnuhpcSource: http://www.cnblogs.com/gnuhpc/ 1. Differences and relationships between Shell and PerlPerl is full of 10 thousand gold oil. It has implemented the functions of various system commands from its own interior, which is much more

Perl Study Notes [not full version]

1. Simple Variables ============== 1. Integer$ X = 123456;Perl stores integer data in floating-point registers. In fact, integer variables are treated as floating-point numbers in Perl, but they are only a special column of floating-point data.The

Linux-user authentication for Web server configuration, installation of Perl language interpreter

First, user authenticationUser authentication is one of the most important technologies in network security, it is the first line of defense to protect network system resources. User authentication controls all logins and checks the legality of

Perl function Set Summary _perl

Process processing functions 1. Process Start functionFunction name EvalCall Syntax eval (string)The commentary considers a string as a Perl statement execution.When executed correctly, the system variable $@ is an empty string, and if there is an

Classic usage of Perl

Open a file using the Open () function Common methods to open a file are: Copy codeThe Code is as follows: open (FH, "Or die "Couldn't open $ filename for reading: $! "; The open () function usually has two parameters. The first is the file handle,

While watching MHA source, learn the three nodeutil.pm of Perl language

While watching MHA source and learning Perl language three NodeUtil.pmNodeUtil.pm source analysisMHA code is divided into Mha4mysql-manager (Management node) and Mha4mysql-node (Database node) two parts, maybe some people think mha4mysql-node only

Common Perl functions 2

Perl Common function set 2 I. Process processing functions1. Process startup FunctionFunction Name evalCall the syntax eval_r (string)The description regards string as a Perl statement execution.After the command is correctly executed, the

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