linux shell scripting tutorial for beginners

First, topsy variables and environment variables Variables are an essential part of any programming language and are used to hold variables of various types. Scripting languages are mostly weakly typed languages (dynamic languages), which means that when you use a variable, you don't have to declare the type of the variable in advance, just assign the value directly. In bash, the value of each variable is a string. The value is stored as a string, re

In this tutorial we create a variety of dialog boxes in the Linux interactive shell script, the dialog box can be friendly to the operator in Linux, interested friends can refer to learning about.When you install new software in the terminal environment, you can often see the Information dialog box pop-up and need your

Shell Getting Started Tutorial: Shell variables Variable A variable is a place to store data temporarily, and is a memory space. Bash shell and other programming languages, there is no "data form", which means that the default is not to distinguish between a variable is an integer or a floating-point type, unless you

between 1 to 5:"Read AnumCase $aNum in1|2|3|4|5) echo "Your number is $aNum!";;* echo "You don't select a number between 1 to 5!"Continueecho "Game is over!";;EsacDone Running code found that when you enter a number greater than 5, the loop in the example does not end, and the statement echo "Game is over!" Will never be executed. Shell Functions All scripts so far in this tutorial have been executed

When you install new software in a terminal environment, you can often see the Information dialog box pop up and need your input. The type of dialog box has a password box, checklist, menu, and so on. They can guide you in an intuitive way to enter the necessary information, and the benefits of using such a user-friendly dialog box are obvious. As shown in the following illustration: When you write an interactive shell script, you can use su

Sunshine insurance group's java deserialization command executes two packages (write shell tutorial Linux) Celebrate the achievement of 1000rank and share some experience in shell writing.This is a Linux server and has the default jboss interface. 0x01Http: // 111.203.203.24

Linux Shell script series tutorial (6): array and associated array This article mainly introduces the Linux Shell script series (6): array and associated array, this article explains what arrays and associated arrays are, defines and prints common arrays, and defines and pri

Linux Shell script series tutorial (2): terminal printing command details This article mainly introduces the Linux Shell script series (2): terminal printing command details, this article focuses on echo terminal printing, printf terminal printing two Print Output commands,

Introduction to Shell Script (bash) As is known to all, Unix is famous for its gadgets, using a number of simple gadgets to accomplish a job that would otherwise require a lot of software development, making UNIX the ideal system platform for many people. In many gadgets, Shell script is the most basic, powerful, and most widely used. It uses a wide range, not only from system start-up, program compiling,

compressed disc ISO image file on diskMkisofs-j-allow-leading-dots-r-V "Label CD"-iso-level 4-o./cd.iso data_cd Create an ISO image file for a directoryCdrecord-v dev=/dev/cdrom Cd.iso Burning an ISO image fileGZIP-DC cd_iso.gz | Cdrecord dev=/dev/cdrom– burning a compressed ISO image fileMount-o Loop Cd.iso/mnt/iso mount an ISO image fileCd-paranoia-b from a CD to the audio track to the WAV filecd-paranoia-" -3″ from a CD to the audio track to the WAV file (parameter-3)Cdrecord–scanbus scan bu

This article mainly introduces the Linux Shell Script Series tutorial (four): Using functions to add environment variables, this paper introduces a knowledge of environment variables, and gives the general add environment variables and the use of functions to add environment variables, the need for friends can refer to the First, Introduction Environment variab

1. Connect MySQL database The way to connect to a database in a shell is simply to specify a username, password, the name of the database to connect to, and then redirect to enter the MySQL statement as follows: Mysql-u username-p PASSWORD DATABASENAME show databases;Eof But this is not a good idea, any user using the script can see the database user's account and password, to solve this problem, you can use a MySQL database special configuration file