Unix If Command Examples

After you have finished this chapter, you will be able to do the following: Explain the purpose of the device file explain the meaning of the main number and the number of the different character devices use Lsdev to list the main numbers of kernel drivers use LS to observe the primary and secondary numbers of a device file Use Ioscan to list device files associated with a specified device using ISSF to describe the characteristics of a device file. Assign a disk, tape, or CD device file name, determine the target number of the control card and the target address of the associated device assigned to a terminal or a Xiandai device file ...

At the same time, through the introduction of the following two examples, to consolidate the above problem analysis of the introduction: a multithreaded application of the performance problem analysis of a crash problem analysis of UNIX program http://www.aliyun.com/zixun/aggregation/17253. HTML > FAQ classification UNIX Run programs, often encounter the following types of problems: Crash memory leak handle leak process does not respond to the performance of the expected logic error UNI ...

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 ...

One for the pursuit of high-quality cloud storage solutions providers and service providers, in addressing some of the corresponding cloud storage issues, inevitably have to deal with some of the tasks on cloud computing. This article attempts to interpret the fact that if an ambitious cloud storage provider wants to provide good cloud storage services, then all the cloud computing issues it needs to address are all challenging and belong to a rare category. Therefore, we can calculate a corresponding problem, whether it is "on the cloud" or "under the cloud," and it is understood that a term is called "command line." The expression is as follows: order to lose ...

After completing this chapter, you will be able to do the following: List configuration files read during logon change default user path change default User terminal type change user prompt change user command line editor change user's default printer management Skel The default profile why do you want to customize the user account Set user terminal type custom user prompt set user default terminal, custom user path variable define a command-line editor if simply in passwd and/etc/group ...

There are a number of very useful tools available for Linux administrators to choose from. Here, I'm just enumerating 5 of the tools that Linux administrators need to use in their day-to-day operations. I think that the most powerful tools may not be appropriate for your use, and there are certain tools I forgot to count them in, and if so, I implore you to write down the tools I didn't include in the comments. In addition, the tools mentioned in this article are only optional, not everyone must need them, and the tools that are not mentioned are not meant to be used by Linux administrators, like s ...

The database server is actually the foundation of every electronic transaction, financial and enterprise resource Planning (ERP) system, and it often includes sensitive information from business partners and customers. Although the data integrity and security of these systems are important, the level of security checks taken against the database is not as high as the security measures of the operating system and the network. Many factors can disrupt data integrity and lead to illegal access, including complexity, poor password security, misconfigured, undetected system backdoor, and mandatory routine use of adaptive database security methods ...

"Editor's note" Shopify is a provider of online shop solutions company, the number of shops currently serving more than 100,000 (Tesla is also its users). The main frame of the website is Ruby on rails,1700 kernel and 6TB RAM, which can respond to 8,000 user requests per second. In order to expand and manage the business more easily, Shopify began to use Docker and CoreOS technology, Shopify software engineer Graeme Johnson will write a series of articles to share their experience, this article is the department ...

The intermediary transaction SEO diagnoses Taobao guest Cloud host technology Hall in understanding the Internet entrepreneurship Theory knowledge, began the field to carry out the actual operation of the website business. 　　In this chapter, we will explain in detail how to build a Web site that conforms to the user experience. 　　First, the site's page planning and style design second, the choice of the website programming language three, the choice of website database The above content can be read in detail to the article "Internet Entrepreneurship Success (iii): From theory to practice site to establish combat" look. Iv. hardware requirements and preparation of the website ...

There are three types of applications under Linux (Red Flag Linux default for tar packages and RPM packages): The tar packets are made by the UNIX system's packaged tools tar, such as example-1.2.3-1.tar.gz. RPM Package Red Hat offers a package package format, such as example-1.2.3-1.i386.rpm. DPKG Package Debain Linux provides a package packaging format, such as example ...