practical guide to linux commands editors and shell programming

This article is in the study of "with the old boy learning Linux Koriyuki Shell Programming Practical" the knowledge points recorded in this book. I have benefited greatly from reading this book, but this is only my personal opinion. Now let's get to the bottom of the shell

no parameters, and all the available mix channels on the sound card are listed:[Email protected] sound]$/mixerusage:./mixer You can then easily set the gain size for each mix channel, such as the following command to set the gain of the left and right channels of the CD input to 80% and 90%, respectively:[[email protected] sound]$./mixer CD 90CD gain set to 80%/90%V. SummaryWith the gradual deepening of multimedia application under Linux platform, th

most basic audio programming frameworks and Mode is great for beginners.Resources 1. OSS is the first sound card driver on Linux, and http://www.opensound.com is its core web site, where many OSS-related information can be learned. 2. Alsa is a widely used Linux sound card driver, and provides some library functions to simplify the writing of audio

The problem is as follows:It is known that the Old Boys ' education was released on May 21, 2015 as the latest OP classics,http://edu.51cto.com/course/course_id-839.html Requirements: To make all course titles (about 140 sections) in the course address into an HTML page that can be clicked directly (Please make a table Form, a course name in each line, the course name in order plus ID), or click on the specific course name to go to the specific course address.Results650) this.width=650; "src=" h

open, close does not say, each read a string must be prepared a buffer, ready to waste space, prepared for a short fear of buffer overflow, abuse heart. With bash, that's really handy.6. It's a no-no dynamic language. Oh, the eval command is too powerful, see, the analog pointer to look up the table:Of course, since Bash 3, bash itself provides the ability to refer indirectly (using "${!var}").　　Exception:The bash language is not perfect in all respects, and there are a few special exceptions.

To learn something your need to do it, without the fear of being unsuccessful. I believe in practicality and hence'll be accompanying the practical world of Scripting Language.Learn Basic Shell ScriptingThis article is a extension of our first article understand Linux shell and Basic

In Linux, you can specify an alias for an alias command: in Linux, if the command is too long and does not conform to the user's habits, you can specify an alias for it. Although you can create a "Link" for a command to solve the problem of long file names, the link is powerless for commands with command line parameters. The alias can solve all such problems. Just give some examples: Alias L = 'LS-l'; use L

simple example: #! /Bin/sh Echo "What is your favorite OS ?"Select var in "Linux" "Gnu Hurd" "Free BSD" "Other"; doBreak;DoneEcho "You have selected $ var" If the preceding script appears, select: not found will be #! /Bin/sh #! /Bin/bash: What is your favorite OS?1) Linux2) Gnu Hurd3) Free BSD4) Other#? 1You have selected Linux While/For Loop In shell, y

Simple shell programming in Linux Transfer from: dynamic network Production Guide www.knowsky.com Basics of shell script writing From scheduled backup to simple command execution, Linux

used shell through the echo $SHELLFirst use the Vim editor (or any text editor under Linux) to write the file helloshell.sh (no need to use the. sh suffix name):#!/bin/bashecho "Hello Shell";Save the above file and increase the file execution permissions:[Email protected]:~/shell$ sudo chmod +x./helloshell.shRun the

"Please input your first name:" FirstName #提示用户输入read-P "please input your Las T name: "LastName #提示用户输入echo-E" \nyour full name is: $firstname $lastname "#结果在屏幕输出exit 0First, execute the script in a way that executes directly:As can be seen from the above, the program executes smoothly, then I use the echo command to output the contents of FirstName and LastName, but the output is empty. What is the reason for this? This means that when the child process is complete, the variables or actions i

Reply content:Learn, why not learn. The question is what does this have to do with PHP programmers, like to learn, do you want me to cite a similar "shell Programming for PHP Programmers ten benefits" to learn? To be a programmer so utilitarian, like to learn, Shell may not be easy to use, but to learn a grammar without much time, you learn a little more and no

Linux command line and shell script programming Daquan create function basic script function create function 1. use the function keyword, followed by the function name [plain] functionname {commands} 2. the function name is followed by an empty parentheses, indicating that a function is being defined [plain] name ()... create functions in

information, you can put the error information into the black hole. 1> redirect standard output 2> error standard output > Indicates standard output and error standard output. 2./dev/zero The main purpose of/dev/zero is to create a file with a specified length and is initialized as null. such files are generally used as temporary swap files. 3./dev/tty /Dev/tty is a very practical file. When the program opens this file, the terminal before UNIX/