Perl

Installing Perl in a Linux environment is really easy, but the reason I recorded here is because after the installation, there has been a problem plagued me, that is, I set up the installation directory has always been not effective, I always

#!/usr/bin/perl# Filename:BuildSocketTCP.pm## Copyright Axxeo GmbH# Licensed under the Apache License, Version 2.0 (the "License");# You are not a use of this file except in compliance with the License.# Obtain a copy of the License at##

requirements : 40 Elements of the array, according to 8 per line, divided into 5 lines printed out. Such as1 2 3 4 5 6 7 89 10 11 12 13 14 15 1617 18 19 20 21 22 23 2425 26 27 28 29 30 31 3233 34 35 36 37 38 39 40cause : There are some scenarios for

The method of encrypting signature in Ucloud API document is not clear, and there is no Perl version, specially wrote a copy for everyone to refer UseUri::Escape; UseUTF8; UseEncode; UseANYEVENT::HTTP::LWP::useragent; UseDigest::SHA QW (SHA1

In general, the timeout setting in Io::socket::inet is for ConncetIf you want to set the RECV receive timeout, you can set this:1UsrSocket:2......3 setsockopt($socket, Sol_socket, So_rcvtimeo,Pack('l!l!',1,0));4 #Note that there are three parameters

Index1. Statistics of the length of Fasta, FA and FASTQ files, the number of reads in the statistics FASTQ, the individual reads length, the total length of reads, and the number of Fasta in the statistics Contig file, listing the name, the length

Classification of regular engines The classification of regular engines is divided into two main categories: Dfa:egrep, awk, Lex, flexnfa:.net, PHP, Perl, Ruby, Python, GNU Emacs, ed, sec, VI, grep, and so the history of NFA is a bit

In Perl, the call System command has two situations, ' cmd ' and ' system ' cmd, their main difference being ' cmd ' will get the return result, and system "cmd" will directly output the result to the screen, for this difference has the following

We have used UNIX or Linux systems, not unfamiliar with tools such as Vi,sed,grep,awk, you should know the regular expressions and metacharacters for the delimiter search pattern. So what is a regular expression? A regular expression is a sequence

Many times, we want to make certain changes to the content of the original file, although Linux has sed this powerful text editing command, but he can only generate new files or print to screen (perhaps Sed also has the function of modifying the

0x00 backgroundA few days ago someone told a conference about a problem that existed in Perl for 20 years. It's really heartbreaking to be a person who will only Perl without Python. After watching the video feel black to eat nothing.This is like a

PrefaceIn Perl, you can use localtime to get local dates and times without installing other modules.In a scalar context, the string format is returned.My $localtime = localtime ();p rint "\n$localtime\n";Return:Thu Jan 1 18:17:56 2015In the context

Symbol tableEach package has its own symbol table, which is a hash table. The keyword is the variable name, file handle, directory handle, and subroutine in the package. The value is typeglob. Each symbol is assigned a typeglob (* X), which

1. Change the Directory Chdir "/etc" or die "can't chdir to '/etc '! \ N "; If the parameter is omitted, the system returns to the user's home directory, which is the same as that of CD; 2. wildcard file name My @ all_files = glob "*"; # files

I. Hash Variables A hash variable is also called an associated array. Like an ordinary array, you can use a subscript to access the data elements. The difference is that the subscript of a hash variable can not only be a non-negative integer, it can

Here I'll summarize three ways to open a temporary file using Perl. The first wayIs to create the new object via module IO: file to get a read/write file handle as below. My $ temp_fh = IO: file-> new_tmpfile; Perl closes these files when the scalar

Install perl5.8.8:CD perl-5.8.8 & Rm-F config. Sh policy. Sh& SH configure-dusethreads-de & make &&Make Test & make installMV/usr/bin/perl. BakLn-S/usr/local/bin/perl/usr/bin/perl After Perl is installed, many modules can be installed to enhance

When creating an array in perl, you can use qw. However, if you want to create an array consisting of 20 people, and the name of each person is in this form of "Join smith" "Harry Potter", that is, each name contains both a surname and a name. In

In file I/O, to read data from a file, the application must first call the operating system function, transfer the file name, and select a path to the file to open the file. This function retrieves a sequence number, namely, the filehandle of a Perl

When you upgrade webmin, the following message is displayed:Error-Perl execution failedUndefined subroutine & WebminCore: translate_filenameCalled at/usr/libexec/webmin/web-lib-funcs.pl line 14.At this time, we can log on via ssh, rootYum-y upgrade