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How do you remove a value from an array in Perl? _perl

I'm not sure if undef has a definite relationship with the elimination of values from the array, guess what, if we treat undef as "empty," there will be some connection. But generally, assigning something to undef and deleting something is different. First look at how to assign the elements of an array to undef, and then learn how to remove elements from the array. Start with the following code: Copy Code code as follows: Use Data::D umper qw (

Use of common Perl modules

A brief description of http://www.perldoc.com/perl5.6/pod/perlmodlib.html for some common modules Use modules in Perl:Module: http://www.cpan.org/modules/01modules.index.htmlInstallation module:1. Perl makefile. pl2. Make3. Make Test4. Make installYou can also run the following command to install the module (the applicable system RedHat 9.0 is known. I don't know about other systems. Please try again.Perl-mcpan-e shell> Enter: Install model_name View the module help:Perldoc model_nameFor example

Modern dump technology and protection measures (II)

Modern dump technology and protection measures (II) Dynamic unpacking Another common method to deal with dump is dynamic packing. The idea is that Protector does not completely unpack the protected program, but is only part of the unpack. First, when the first unpack page is about to complete, Protector intercepts the exception and unpack the requested page, then it can delete the previous page from the memory. In this way, the image of the protected process has never been complete in the memor

Blackberry's "brand new" BBX Operating System: Don't change the OS

with the help of a third-party mobile device management (MDM) tool in a few months. Recall that in July March this year, RIM began to promote the market for its unofficially released BlackBerry PlayBook tablet, and said that its QNX operating system would be able to smoothly run Android applications. It turns out that these scams once again played with our feelings. In the end, RIM used a mechanism similar to the Android runtime environment. You need

Use shell to write a mysql data backup script and shellmysql Data Backup

can google it separately, so there will be no more details ): create user dumper@'127.0.0.1';grant select on tempdb.* to dumper@'127.0.0.1';grant show view on tempdb.* to dumper@'127.0.0.1';grant lock tables on tempdb.* to dumper@'127.0.0.1';grant trigger on tempdb.* to dumper

[Arrangement] Typical RTOS supporting multi-core processors

and transmit exchange data. The support for multi-core processors is achieved through the extension of the synchronization primitive library. It is a common extension of RTOS and does not need to make too many modifications to the current RTOS, you only need to add a relatively independent extension library to support the multi-core processor. At the same time, the multi-core mechanism is not transparent to the application, and the application needs to schedule multiple tasks to run on the mult

Introduction to Perl basic array sorting methods

Introduction to Perl basic array sorting methods This article describes how to use Perl to sort strings or numeric arrays. Perl has a built-in function called sort which can undoubtedly sort an array. The simplest form is to pass an array, which returns an array composed of sorted elements. @ Sorted = sort @ original. ASCII-based sorting The Code is as follows: #! /Usr/bin/perl Use strict; Use warnings; Use 5.010; Use Data: Dumper qw (

Brian's Guide to solving any Perl Problem

this. Check whether there is a problem with the code and expression before the wrong line number. Is that variable value what you think?Don't guess! When using a value in an expression, check whether it is correct. Print is the best Debugger in the world. Print stderr "the value is [$ value] \ n ";I enclose $ value in parentheses because I can see whether there are spaces or line breaks at the beginning and tail. If this value is not a scalar, I use data: d

[windows]_[Intermediate]_[using command-line tools dumpbin parsing files]

DUMPBIN (vs comes with)1. Function symbols for exporting LIB files (symbols)Dumpbin/exports Zlib1.libMicrosoft (R) coff/pe dumper Version 10.00.40219.01Copyright (C) Microsoft Corporation. All rights reserved. Dump of file Zlib1.libfile type:library exports ordinal name 1 [email protected] [ email protected] [email protected] 2 [email protected] [ email protected] 3 [email

How to export privateframework in IOS

If you develop your own IOS software (do not want to use appstore) and want to make it powerful, you need to use privateframework, and the tool used is class-dump. it can export classes in the dynamic library. I recommend a small ruby-written software that can easily export the required headers. Go to http://rubygems.org/gems/private-dumperto download private-dumper-0.2.0.gem Open the command line and enter the following command for installation:

Perl cleanup of duplicate files on the computer-continued

In the previous article, you used Perl to search for duplicate files on your computer. Full source code: Use File: dirwalk; Use File: basename; Use Data: dumper; Use warnings; Use strict; My $ DW = new file: dirwalk; My % files; Fileparse_set_fstype ("mswin32 ");$ DW-> onfile (Sub {My ($ file) = @_;Push @ {$ files {basename ($ file)}-> {"paths" }}, $ file;$ Files {basename ($ file)}-> {"num"} + = 1;Return file: dirwalk: success;}); My $ htra

Use Perl to clear duplicate files on your computer (continued)

CopyCode The Code is as follows :#! /Usr/bin/perl Use File: dirwalk; Use File: basename; Use Data: dumper; Use warnings; Use strict; My $ DW = new file: dirwalk; My % files; Fileparse_set_fstype ("mswin32 "); $ DW-> onfile ( Sub { My ($ file) = @_; Push @ {$ files {basename ($ file)}-> {"paths" }}, $ file; $ Files {basename ($ file)}-> {"num"} + = 1; Return file: dirwalk: success; } ); My $ htrace; Open $ htrace, '> trace.txt '; Select $ htrace; $ DW-

Introduction to Perl Basic Array sorting methods

In this article we learned how to sort strings or arrays of numbers in Perl. Perl has a built-in function called sort. There is no doubt that you can sort an array. The simplest form is to pass an array that returns an array of sorted elements. @sorted = Sort @original. Sort based on ASCII code The code is as follows: #!/usr/bin/perl Use strict; Use warnings; Use 5.010; Use Data::D umper qw (dumper); My @words = QW (foo bar zorg moo); Say

Daily one shell (ix) Yum install package sort go heavy

libxslt libxslt-devel zip unzip glibc.i686 libstdc++.so.6 cairo-devel Bison-devel ncurses-devel Libaio-devel Perl perl-devel Perl-data-dumper Lsof pcre pcre-devel vixie-cron crontabs expat-devel readline-devel wget python-devel python-imaging zip unzip OpenSSL op Enssl-devel gcc libxml2 libxml2-dev libxslt* zlib zlib-devel libjpeg-devel libpng-devel libwebp libwebp-devel freetype fre Etype-devel lsof pcre pcre-devel vixie-cron crontabs crontabs ICU l

MySQL 5.7 Enhancements to the new feature semi-synchronous replication

Tags: libc thread A job more modify global IO thread sql1. Background information semi-synchronous replication The common replication, the asynchronous replication of MySQL, relies on the MySQL binary log, also known as binary logs, for data replication. For example, two machines, one host (master), the other one is slave (slave). Normal replication is: Transaction one (T1) writes Binlog Buffer;dumper thread notifies slave that there is a ne

Development Language of Douban: omnipotent python

In the face of the eye-catching Pearl (Perl) light, the spirit snake (Python) is more powerful than ever before. It can run on a variety of OS such as MS-DOS, Amiga, BeOS, OS2, VMS, QNX, etc. with the eye-catching Pearl (Perl) light, the spirit snake (Python) is more powerful. It can run on a variety of OS such as MS-DOS, Amiga, BeOS, OS/2, VMS, QNX, etc. it is faster and better than Perl and VB, and it is

From OPENQNX Chinese forum to the post, interesting

OPENQNX Chinese Forum Index--Sihai----Universal Concentric QNX Forum http://www.openqnx.com/chinese/viewforum.php?f=2 Reposted It should be heard that BlackBerry released its Tablet PC playbook, hardware configuration good, seven inch screen, ARM dual core 1ghz,1g memory, 1024x600, dual camera, 1080p HD output ...Most of all, the top runner is QNX. And in the future,

How to Use eclipse to debug Perl applications

typical Perl programmer how to debug his application, he will mostly tell you that he only uses simple output statements to dump information during program execution. For example, you can add a simple statement to the loop to output the value you are calculating or processing, as shown in Listing 1. Listing 1. debug with output statements my $sth = $dbh->prepare($query);  $sth->execute();  while(my $row = $sth->fetchrow_hashref()) {   print STDERR Dumper

[Windows] _ [elementary] _ [use the command line tool dumpbin to analyze the file] and command line dumpbin

[Windows] _ [elementary] _ [use the command line tool dumpbin to analyze the file] and command line dumpbin Dumpbin (vs built-in) 1. Export the function symbol (symbols) of the lib File) Dumpbin/exports zlib1.lib Microsoft (R) COFF/PE Dumper Version 10.00.40219.01Copyright (C) Microsoft Corporation. All rights reserved.Dump of file zlib1.libFile Type: LIBRARY Exports ordinal name 1 _adler32@12 140 _adler32_co

Beginning Perl Reading Notes ~ Chapter 13

(open_log close_log write_log log_level );When you call open_log, you can call the full write operation:Acme: webserver: loggerexporter: open_log ()Abbreviated call:Open_log () You can also declare the module to be imported when using the module: Use Data: dumper QW (dumper );# You can directly call dumper () Several common packages Dat

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