bash programming language tutorial

born from the IT community, C ++, C #, and Java language beginners. When learning bash programming with this background, it is often difficult to get used to it. Some good coding habits in C seem completely unfeasible in the bash world.There cannot be spaces on both sides of the 1.1 equal sign in the C

? ? ? ? ? ? ? 1 | | 1 =1? ? ? ? ? ? ? 0 | | 1 =1? ? ? ? ? ? ? 0 | | 0 =0????? Non:? ? ? ? ? ? ? ! 1 = 0? ? ? ? ? ? ? ! 0 = 1??? Short Circuit rule:????? ~] #COMMAND1 COMMAND2? ? ? ? ? ? ? ? COMMAND1 is "false", then COMMAND2 no longer executes? ? ? ? ? ? ? ? Otherwise, COMMAND1 is true, then COMMAND2 must perform?? ? ? ? ? ? Example: [[email protected] ~]# touch/tmp/test.etc ls/etc >/tmp/test.etc? ? ? ? ? ? ? ? ? [Email protected] ~]# cat/tmp/test.etc?????? ~] #COMMAND1 | | COMMAND2? ? ? ? ? ?

Article title: Linux programming-11. ShellScript (bash) -- (2) Tutorial example. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. "Hello world" Shell Script According to the traditional program teaching example, this section de

Daniel RobbinsPresident and CEO, Gentoo Technologies, Inc.March 2000 By learning how to program using the bash scripting language, you can make the daily interaction of Linux more interesting and productive. You can also use the familiar and favorite standard UNIX concepts (such as pipelines and redirection ). In this three-part series, Daniel Robbins provides an example of how to program using

Bash concise tutorial -- variables, bash concise tutorial Variables 1. Preface Bash is a popular scripting language in * nix systems. As a scripting language, variables are the basic el

Visual C + + (VC/MFC) learning ebook and development tools download see here an unprecedented network of the strongest and strongest C + + data indexes: E-C + + programming language learning Materials Panorama ebook + video Tutorial VC++/MFC (VC6) Development Technology Quality Learning materials Download Summary Visual C++/MFC Digita

days floatmoney=0, Ave; while(n -) { money=money+0.8*N; Day++; N*=2;//N each x2} Ave=money/Day ;printf ("I'm a jerk, I buy apples every day.") I am Tao Tao I bought%d apples ", N/2);//Because n exits the loop because the n> or =100 is because the number of X is 2 so I have to/2 to get the amount of the Tao to buy apples printf ("The result is%.6f", Ave); return 0;} I'm a jerk. I buy apples every day. I'm Tao Tao, I bought 64 apples.//The result is 16.799999Code for the preparation of level

imeasure type, and call the method in which to calculate the area and perimeter of the triangle with an edge length of 10.6.5>: In addition to the design of a new class, while inheriting the following interface Iameasure and the 2nd above the imeasure, in addition to providing a specific length of the equilateral triangle side length and the area of the calculation method, but also realized the iameasure of areas () members, Provides a method for calculating the square area.Interface Iameasure{

SQLite tutorial (14): C language programming example code (2), sqlite programming example 3. Efficient batch data insertion: Before giving the operation steps, let's briefly describe the concept of batch insert to help you read the subsequent sample code. In fact, batch insert is not a new concept. It is supported in t

SQLite tutorial (13): C language programming example code (1), sqlite programming example 1. Get the table Schema information: 1) dynamically create a table. 2) obtain the table field information, such as the number of fields and the type of each field, based on the API provided by sqlite3. 3). Delete the table. See th

Basic syntax for BASH The simplest example of--hello world! About input, output, and error outputs Rules for variables in BASH (similarities and differences with C language) Basic Process Control syntax in BASH Use of functions 2.1 Simplest example of--hello world!Almost all of the first e

Original address: Lax Language TutorialsAndrew BinstockEvery year in the review of Jolt Awards books, I will be a number of language tutorial books are exhausted. Judging from these years of experience, these language tutorials are well written, but in addition, there are few bright spots. In other words, these books a

This article mainly introduces the development history of the programming language Python. This article describes the development history of the Python language in detail. For more information, see Python as my favorite language. it is concise, elegant, and easy to use. Two days ago, I was excited about the benefits of

Swift code Language Tutorials : At the WWDC2014 conference just past, Apple unveiled a new programming language, Swift. It is reported The swift language inherits the features of C and Objective-c, and overcomes the compatibility problem of C language. For the vast majority

Swift code Language Tutorials : At the WWDC2014 conference just past, Apple has released a new programming language, Swift. It is reported that the swift language inherits the C language and the objective-c characteristic, and overcomes the C

Interrupt Descriptor Descriptor Register instruction: SIDT DSTSimilar to "Sgdt DST".b) Storage machine status word directive: SMSW DSTDST can be a 16-bit universal register or storage unit. No effect on the flag bit.Note: In order to be compatible with the 80286 instruction set (386 CR0 low byte equals 286 machine state word), in 386, the storage machine word should use the stored CR0 Register instruction.2) Real mode and privilege level 0 executable commandsKey register settings directives, et