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To complete this chapter, you can do the following: Understand the workings of the shell describe the user logon process describing user environment variables and the functions of these environment variables. Set up and modify shell variables. Understand and modify some special environment variables such as path, term, etc. Customizing user environment variables for specific applications. 6.1 What is a shell? The shell is an interactive command interpreter. Shell is independent of the operating system, and this design gives users the flexibility to choose the shell that suits their needs. Shell let you in ...

People often ask me if they really should believe in Oss. In other words, the worry is: is the OSS the angel that brings us a good life, or is it a demon that destroys our lives? As a matter of fact, this problem has been raised since the beginning of Linux and various BSD (Berkeley Software distribution) operating systems. In reality, any organization or enterprise is very cautious in planning to use a free software that is not from a reputable merchant. As a routine, generally ...

MySQL has become one of the most widely used databases in the current network, especially in Web applications, which occupy the absolute advantage of small and medium applications. It all stems from its compact, safe, efficient, open licensing and multi-platform, and, more important, the perfect combination of--php with one of the three web languages. Unfortunately, a default installation of MySQL, because the root password is empty and the program vulnerabilities caused by the overflow, so that the installation of MySQL server is a frequent target. What is more serious is that the database is often destroyed after the attack, causing disaster easily ...

The intermediary transaction SEO diagnoses Taobao guest Cloud host technology The Hall publishes the fact communication is an interesting matter, wants to investigate each piece of news.     Over the past six years, we have been working to find free search engine optimization software tools and applications to make it easier for network administrators to work. This article introduces some of the free software tools that can help you achieve effective search engine optimization. This kind of software has many types, here according to the class cent ...

SME network security guidelines. [Theory] As the training site said, the enterprise's network security is a system, do all aspects of what is a major project, even if only a branch of network security also takes a long time to build, so in the early need to resolve the current main contradictions (ie "Stop bleeding" and control most of the risks in the first place). Based on the past experience of several of our people, we suggest that you have the following key positions in the control, you can achieve more with less effort immediate effect: 1) port control. All server non-business ports are all closed to the internet, managing ...

The intermediary transaction SEO diagnose Taobao guest Cloud host technology Hall recently a lot of SEO novice, I believe they also saw a lot of SEO of the so-called introductory tutorials, I feel that many of the internet is all belong to the soft wen level, really can let you learn not many things. Guangdong Xingyu SEO collected and collated some basic tutorial materials first we need to explain what is called Seo:seo is search Engine optimization abbreviation, in English description is to use ...

The intermediary transaction SEO diagnoses Taobao guest Cloud host Technology Hall website revision needs to note: 1. Site URL do not change 2. Add new page speed not too fast 3. Optimize the speed of the Web page also want to control, not all the pages have changed. 4. If URL changes must be made, the old URL should be done 301 to the new URL Web copy writing: 1. The title should be accurate and concise 2. Multiple segmentation to prevent reading tiredness. 3. Tone not official, integrated into the personal characteristics of 4. Use less empty vocabulary 5. Small title: To help readers ...

The intermediary transaction SEO diagnoses Taobao guest Cloud host technology Hall now the network has many SEO's so-called introductory tutorials, but most of them belong to the soft level, really can let everyone learn things not much. Baidu SEO reproduced this title as "Web site SEO Rookie level Tutorial" article, and the relevant content according to their own views have been part of the amendment. This article I was found in TechWeb, the original text should be written by Zac Predecessors, unfortunately, the original link did not find, reproduced please indicate from search engine optimization seo every day. Have a very friendly and ...

The intermediary transaction SEO diagnoses Taobao guest Cloud host technology Hall Nowadays, online are all the SEO, but also a lot of beginners are looking at the so-called door materials, I feel that many of the online is a soft level, really can let you learn things are not many. 　　So we collected and sorted out some basic tutorial materials. First of all we need to explain what is called Seo:seo is search Engine optimization abbreviation, in English description is to use some ...

The intermediary transaction SEO diagnoses Taobao guest cloud host technology Hall SEO translates into Chinese is "the search engine optimizes", the search engine is in addition to the email is used most the network behavior way. 　　This article lists some of the site's SEO Rookie-level tutorials. Site content is the first element of search engine optimization 1. 　　A lot of original content can help you to establish a good reputation and authority in the customer's heart. 　　2. Other webmaster will automatically link to your website. Se the way to judge the original source of the article: ...