What is 20.1 shell?
The shell is the intermediate medium used when the system interacts with the computer hardware, and it is just a tool of the system.
In fact, he has a layer of things between the shell and the computer hardware-the
I. PrefaceShell programming is widely used in the Unix/linux world, and mastering shell programming is a must for a good unix/linux developer and system administrator. The main task of script debugging is to find out the cause of the script error
Transferred from: http://itlab.idcquan.com/linux/SHELL/727128.htmlThis paper introduces the shell script debugging technology comprehensively and systematically, including using echo, tee, trap and other commands to output key information, tracking
Shell programming is widely used in the Unix/linux world, and mastering shell programming is a must for a good unix/linux developer and system administrator. The main task of script debugging is to find out the cause of the script error
Common shell: -------------- from "laruence's Linux private dish"
In the early UNIX era, there were many developers, so shell had many versions based on the developer's differences, such
Frequently heard Bourne shell (SH ),C shell,Commonly used
Shell is like the editor: everyone has their own choice and tries to defend the choice and tell you why it should be used ). Indeed, shell provides different functions, but they all implement the core concept of development decades ago.
Why shell programming?
In Linux, although there are a variety of graphical interface tools, ghost is still a very flexible tool. Shell is not only a collection of commands, but also a very good programming language. You can use shell to automate a
Create a scriptThere are many different shells in Linux, but usually we use Bash (Bourne again shell) for Shell programming because bash is free and easy to use. So the script I've provided in this article is all about using bash (but in most cases
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