linux shell scripting cookbook

1th Shell Basics 1.1 What is a shell The shell is a command interpreter, which at the outermost of the operating system, is responsible for directly talking to the user, explaining the user's input to the operating system, and processing the output of a wide variety of operating systems, returning the output screen to the user.1.1.1

to learn the Linux Shell Pro Gramming, and I decide towrite the most important concept and skills down to remind myself or to providethose who is inte Rested in shell programming with the starting material ...I'll record my progress and the useful skills I learned when the project iscarrying on the Qa form, which I thin K is a clean and simple to toorganize my t

Debugging Methods for Shell scripts -N: Read the command in the script but not execute it to check for syntax errors in the script -V: Executes scripts while printing executed script commands to standard error output -X: Provides trace execution information and prints each command and result in sequence There are three ways to use these options, one to provide parameters at the command line: $ sh-x./script.sh The se

Tags: sed type technical tool awk user interaction return and x86Blog Address: http://www.moonxy.comFirst, prefaceCommon programming languages are divided into two categories: one is compiled languages, such as C, C + +, and Java, which are compiled by compilers before they travel. The other is an interpreted language, which does not need to be compiled, and when executed, it needs to be interpreted on a line by the interpreter, such as awk, Perl, Python, and Shell.The

The shell is an interface that users interact with the kernel, and the most popular shell is now called the Bash shell. The shell is also a programming language , Shell Scripting The original text is discussed with the author: htt

is line4..Wq First create a new file Base.txt, and then ed this file, enter a to indicate the last append, entered four lines of text ... represents the end of the input. Wq means save exit. Let's use the ED command again to manipulate the file in the shell script. As follows. #!/bin/shEd Base.txt 3 # To line 3rdD # Delete the lineI # Bank increaseThis is line 3 new. # New Line Content. # EndWQ # Wq means saveEof The results of the execution are show

From the programmer's point of view, the shell itself is a program written in C language, from the user's point of view, the shell is the user and the Linux operating system communication Bridge. The user can either enter command execution or use shell scripting to do more c

In Linux shell programming, in most cases, test commands can be used to test the condition, here is a simple introduction, easy to use friendsFor example, comparing strings, judging whether the file exists and whether it is readable, etc., usually uses "[]" to represent the condition test.Note: The space here is important. The space to ensure the square brackets. I have wasted a lot of precious time because

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