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Perl variables (1)--pure variables

Perl variables (1)--pure variables

Socket programming using Perl language

Network programming is a mysterious and complex art, but it is also very interesting. The Perl language provides a wealth of TCP/ip network functions, all of which are directly derived from the socket library functions of the C language.

Classic usage of Perl: Use Sysopen() for more control

Classic usage of Perl: Use Sysopen() for more control

Classic usage of Perl: reading into paragraphs

Classic usage of Perl: reading into paragraphs

Classic usage of Perl: reading multiple records

Classic usage of Perl: reading multiple records

5 common mistakes in Perl

python pickle module

Persistence means retaining an object, even between multiple executions of the same program. Through this article, you will get an overview of the various persistence mechanisms for Python objects, from relational databases to Python's pickle and other mechanisms. In addition, it will also give you a deeper understanding of Python's object serialization capabilities.

Microsoft Sql Server Error 5123 Attached Database Error

Microsoft Sql Server may cause this result by reinstalling the system and renaming the host name or logging in with Windows identity when attaching the database. This error may be reported under Vista or Windows 7.

Solution to error 5123 when attaching database in sql2008

Today I reinstalled the database on my home computer. When attaching an existing database, a 5123 error occurred.

Correct solution to error 5123 in SQL Server attached database

Because I have a database tutorial based on SQL Server 2005, the sample database used in it is AdventureWorks for SQL Server 2005, and my machine is installed with SQL Server 2008, and the sample database is AdventureWorks for SQL Server 2008. At first I thought that the database structures of the sample databases AdventureWorks for SQL Server 2005 and AdventureWorks for SQL Server 2008 should be similar. However, during the exercise, I discovered two

Three ways to permanently add environment variables in Linux

This article introduces: Three ways to permanently add environment variables in Linux

Summary of methods for adding environment variables in Linux

Linux is not sensitive to whether environment variables have double quotes or whether variables are enclosed in {}. I took a quick look at the profile file and it seems that if the system finds that a variable does not have quotes, it will automatically add it.

Several methods for setting Linux environment variables

Environment variables are closely related to Shell. A Shell is started after the user logs in to the system. For Linux, this is usually bash, but it can also be reset or switched to other shells. For UNIX, probably CShelll. Environment variables are set through Shell commands, and the set environment variables can be used by all programs run by the current user. For the shell program bash, you can access the corresponding environment variables through variable names, and set the environment variables through export. Below are several examples to illustrate.

How to set and view Linux environment variables

This article introduces: How to set and view Linux environment variables