Unix Operating System Commands

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 ...

By completing this chapter, you will be able to do the following: Understand the purpose of a pipe to create a pipe that obtains output from one command, and then manufactures input for another command using Tee,cut,tr,more, and PR filter 10.1 pipe profile shell provides the ability to connect commands through pipelines. The flexibility to reflect the operating environment of the UNIX system is fully filtered through the files. You can use pipelines to filter the output of a command. This chapter will introduce the use of pipes, and some filters (Cut,tr,tee and PR), which ...

First, ping it is used to check whether the network is smooth or network connection Speed command. As an administrator or hacker living on the web, the ping command is the first DOS command that must be mastered, which uses the principle that the machine on the network has a unique IP address, we send a packet to the destination IP address, and the other side returns a packet of the same size, According to the returned packets we can determine the target host's existence, can initially judge the target host's operating system and so on. Let's take a look at some of its common operations. First look at the help ...

By completing this chapter, you can do the following: Describe the functions of different network services understanding local area networks (LANs) in Unix find the host name of the local host and the hostname of the other system on the LAN. Use the Arpa/http://www.aliyun.com/zixun/aggregation/33795.html >berkeley service to perform remote logins, remotely file transfers, and remote command execution. 11.1 What is a LAN? The local area network (LAN) is in a small ...

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 ...

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 ...

By completing this chapter, you will be able to do the following: Describes the effect of a return value in a conditional branch statement. Use the test command to parse the return value of a command. Use the IF and case structures in a shell program. &http://www.aliyun.com/zixun/aggregation/37954.html ">nbsp;1. Return value shell variable"? "To save the return value of the last executed command: 0: ...

Linux OS, is a computer operating system, the Linux operating system's kernel name is also "Linux." 　　The Linux operating system is also the most famous example of http://www.aliyun.com/zixun/aggregation/29607.html "> free software and open source code development." Simply put, Linux is a set of free to use and free to spread UNIX-like operating system, it is mainly used for the Intel x86 series CPU ...

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 ...

This paper is an excerpt from the book "The Authoritative Guide to Hadoop", published by Tsinghua University Press, which is the author of Tom White, the School of Data Science and engineering, East China Normal University. This book begins with the origins of Hadoop, and integrates theory and practice to introduce Hadoop as an ideal tool for high-performance processing of massive datasets. The book consists of 16 chapters, 3 appendices, covering topics including: Haddoop;mapreduce;hadoop Distributed file system; Hadoop I/O, MapReduce application Open ...