What Does Command Mean

In many cases, we want to know how much space the individual files and directories on the hard disk are using. And the total space occupied by a directory. The du command can help us. After we enter the terminal, we can use this command in any directory. Now use this command in the OPT directory of our own Linux system. We tried to enter the command: Du. In the figure above, we use the Red line to show the size of each file and directory that occupies the hard drive. The position of the green coil is relative to the name of each file and directory. And the position of the blue circle is the order of the current eye ...

What is a process? Simply put, the system is running the program. What if we want to know which programs are running in the current system? It's easy to use the top command to get what you want. We enter in the terminal: top, see what is displayed? Wow, so many programs are running in the system (each line represents a program)? 　　What do the above columns mean? The pid:pid is the number that the system is assigned to per program, or process itself. Because the system has to track it after the program is started, why? Because at least we have to find it.

The intermediary transaction SEO diagnoses Taobao guest Cloud host technical Hall recent SEO consultant discovers a phenomenon, publishes the new article to search the article link to have the result, the search article title or the article content has no shadow, the site domain name also has no shadow. 　　So SEO consultant guess: If the site can show from the side of the search engine for the weight of the site, it is possible. A friend may be questioned, Baidu Lee on the Baidu snapshot of a number of instructions has been clearly stated: snapshot of the update and the page on whether there is important new content has straight ...

Intermediary transaction http://www.aliyun.com/zixun/aggregation/6858.html ">seo diagnose Taobao guest cloud host technology Hall as an SEO personnel, view the site is included in the work every day must do homework, included up, Work more energetic, included down, a bit depressed, especially when the serious fall, will immediately to A5 forum post asking everyone your collection is not also declined. The reason why we are so nervous is because we ...

Familiarity with the command line interface is significant to the use and management of Linux operating systems. This chapter describes the knowledge of shell operations in the Red Flag Linux http://www.aliyun.com/zixun/aggregation/16493.html >desktop 6.0 system, including file and directory operations, Document and System Management and maintenance, process control, equipment management and other basic content. 8.1.1 Shell profile ...

Here is a translation of the Redis Official document "A fifteen minute introduction to Redis data Types", as the title says, The purpose of this article is to allow a beginner to have an understanding of the Redis data structure through 15 minutes of simple learning. Redis is a kind of "key/value" type data distributed NoSQL database system, characterized by high-performance, persistent storage, to adapt to high concurrent application scenarios. It started late, developed rapidly, has been many ...

This paper introduces how to build a network database application method by MySQL of the golden combination of Web database, PHP is a server-side embedded hypertext Processing language similar to Microsoft ASP, it is a powerful tool to build dynamic website. While MySQL is a lightweight SQL database server that runs on a variety of platforms, including Windows NT and Linux, and has a GPL version, MySQL is considered the best product for building a database-driven dynamic Web site. PHP, MySQL, and Apache are Linux ...

Several articles in the series cover the deployment of Hadoop, distributed storage and computing systems, and Hadoop clusters, the Zookeeper cluster, and HBase distributed deployments. When the number of Hadoop clusters reaches 1000+, the cluster's own information will increase dramatically. Apache developed an open source data collection and analysis system, Chhuwa, to process Hadoop cluster data. Chukwa has several very attractive features: it has a clear architecture and is easy to deploy; it has a wide range of data types to be collected and is scalable; and ...

In the past, we have introduced some principles of software development, such as the 10 commandments of high quality code and the UNIX design principles described in the UNIX legend (next article). I believe that you can learn from middle school some knowledge of design principles, as I said in the "How Do I Recruit procedures", a good programmer usually consists of its operational skills, knowledge level, experience level and ability four aspects. Here I would like to talk about some of the principles of design, I think these things belong to the long-term experience summed up knowledge. These principles should be understood by every programmer. But...

When the world's first computer was unveiled at the University of Pennsylvania in Philadelphia on February 14, 1946, in the face of this 18,800 vacuum tube, 50 feet long, 30 feet wide, covers 1500 square feet, weighing up to 30 tons (about a half of the classroom, six elephants Heavy) "mega" 　　Computer, no one can think of, in the era of electron tubes, transistors, integrated circuits and LSI, more than 60 years later the PC can only be a book thick. When the United States Department of Defense Advanced Research Program (ARPA) in the world ...