bash programming language tutorial

SHELL programmingDirectory:1.shell Brief Introduction2.shell Programming Preparation3.shell Programming Structured Language Building4. OtherTwo examples of 5.shell programmingWrite in front:1.Hello World#！ /bin/bash# This is aexample of bash helloworld# you can start Shell

A detailed description of the variables of Bash programming under Linux (i)1. Language classification:1.1. Static language: Compiled languageStrongly typed: Variables must be declared beforehand and even initialized before they are used;Programs written in advance into executable formatRepresentatives are: C, C + +, JA

The Bash shell script programming knowledge points are as follows (beginner, incomplete, welcome to the discussion supplement):Shell IntroductionA simple introduction to scriptsVariables and referencesArithmetic operationsInteractive programmingSelect JudgmentCondition testCycleFunctionShell IntroductionShell is a special function of the program, provides a user to interact with the kernel interface, it rec

As a result of the work, several bash scripts were written in the previous months, primarily for automated testing, packaging, installation packages, and so on. Although compared to C + + programming, to be simple, stupid, but it in the Unix-like system can greatly improve the efficiency of the work. So here's a brief summary of some of the considerations in scripting. 1. Shell Overview The shell is an inte

Transfer from http://blog.chinaunix.net/uid-20328094-id-95121.htmlA very good bash scripting tutorial, at least not in contact with bash can read!Create a scriptThere are many different shells in Linux, but usually we use Bash (Bourne again shell) for Shell programming becau

specified databaseMd5sum is used to calculate the checksum value, if you add-c to calculate the value and the emitted good text can be used to verify the checksum value, of course, placed under the same directoryThe MKFIFO is used to make pipeline files, but the pipe must be open in either direction or it will not work properly.SEQ is used to output a sequence that can be specified with the B in seq a b CTimeout is used to create a time limit, timeout-s signal specifies that a signal signal is

, and so on, SHell script is roughly similar, When you learn a shell, the rest of the shell will soon start, and most of the time, a shell script can often be used on many kinds of shells. Here I'll explain how you use bash. In fact, when you "man bash", you can see the instructions for bash, but for many people, this is as hard as "wordless". This document, the

Programming styleProgram programming to solve problemsThe instruction organizes the data, the instruction is stackedTo complete a complex taskSequential execution: Traversing execution, running one by oneSelect execution: There is a selection criteria, the result can only have one choice, only to execute some code fragmentsLoop execution: Run the same operation on a class of objects one by one, similar to t

I. Getting Started with bash programmingProgramming Languages:Compiled language: Compiler c,c++Interpreted language: InterpreterInterpreter can run independentlyVariables: Keep the data carrier, the command of the memory spaceLocal variables:Environment variablesLocal variables:Positional parameter variable: $1,$2 、、、,Special variables:The name of the current scr

I. Super tools Terminals, xterms, and shells shell are a full-featured programming environment. The background knowledge is as follows.DEC launched a small PDP-11, known as mini) and a low price of 10000 $), caused a huge response in the university. For ease of transplantation, in 1969, Ken Thompson began to write the first line of code that became opposite to Unix and MULTICS. Later, Dennis Ritchie designed a new

Shell Script ProgrammingFgrep Fast grep quickly retrieves text but does not support regular-regular expressionsProgramming languages: Machine language, assembly language, advanced languages (compile required)Compiler or interpreter: is used to translate a language (usually a high-level language) that humans can recogni

This article focuses on the parts of the bash script that are prone to errors and rarely used but have unexpected effects.Cycle:Normal for loop: for inch a B C 1 2 3 do Echo " $i " DoneNumber sequence loop: for in 'seq-do- echo'$i'done The 'seq ' can also be replaced with {1. +} {Start: This form of the end of the} can represent a continuous sequence of numbers, from small to large can be large to small, but unfortunately not like the Python

clean code that allows developers to write style code that fits the shell script. Python is an interpretive language, which means that there is no need to compile. This makes Python the ideal scripting language. Python also reads, interprets, and outputs a looping style that allows developers to quickly try new code through the interpreter. Developers can implement some of their ideas without having to

Starting today to learn shell programming, when the university learned c,c++, compilation, but long forgotten, I think the algorithm is done, what language is just a tool. Learning here, the class of students, especially a little did not touch the programmer, really very difficult, and the teacher here also out of some tidbits ...Originally taught our teacher cold, the voice is dumb, so let's teach our proj

native C + + language.With the development of Node-js JavaScript used to do server-side development has come to the mainstream. In particular, NetEase open source came out to do a large-scale online game (MMORPG) Framework PomeloIt is now possible to use JavaScript to develop online games.2d game development: Coco Engine Company In addition to the COCOS2D-JS engine. Supports the development of high-performance 2d games with JavaScript. and across all platforms.3d game development: With the rise