Upper:
Process oriented:Sequential executionSelect execution: If, caseLoop execution: For, while, until
One, for statement
Format:for variable in list;Statement 1;Statement 2;...DoneExample 1, write a script, add 10 users, and let each user's password with the user name "
Copy Code code as follows:
#!/bin/bash
For I in {1..10}; Todo
Useradd user$i;
echo user$i | passwd--stdin user$i
Done
Example 2, write a
1, the syntax of the script structure:Shell script is a "program" written using the function of the shell, which uses a plain text file (the file suffix is preferably sh file, which is convenient for us to manage), and writes some shell syntax and instructions (including external instructions) to the inside, with wildc
Document directory
Variable assignment and reference
If sentence
| Operator
Case statement
Select statement ============================================== =
While/for Loop
Quotation marks
Binary to decimal conversion
Circular file copy
Original article: http://www.ha97.com/2619.html
We can use any text editor, such as gedit, kedit, emacs, VI, to write shell scripts. It must start with the following line (the first line of the file must
Shell Script Series Tutorial Two: Start Shell programming2.1 How do I write a shell script?(1) The most common use of VI or mcedit to write shell scripts, but you can also use any of your favorite editor;(2) After the
Create a script
There 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 these scripts can also be run in Bash's eldest sister, Bourne
What is a Shell script? The simplest explanation is that a shell script is a file that contains a series of commands. The shell reads the file and executes all the commands in the file as if the commands were entered directly into the command line.The
row? You need to add a ";" between the commands. TheThe basics before you learn shell scripting7. ~: User's home directory, if Root is/root, ordinary user is/home/usernameThe basics before you learn shell scripting8. : If you want to put a command in the background, you need to add this symbol. This is typically used when the command runs for a very long time.The basics before you learn
Tags: Quick locate run time compressed file Zip Sync Port System archive DirectoryThis book focuses on the use of some of the Linux shell commands, explaining some of the shell's artifice.Chapter One small trial sledgehammerMainly introduces some basic shell instructionsTerminal printing: Echo, printfAliases: AliasTerminal Processing tool: Tput,sttyDate: DateChapter II The Pleasure of orderIntroduce some ba
Linux Shell script interview 25 questions
Q: What is a 1 Shell script and is it necessary?
A: A Shell script is a text file that contains one or more commands. As a system administrator, we often need to use multiple commands to c
Label:... Requirement write root must be judged by an echo capture variable conditionI. Logical judgments in shell scriptsIn the shell script, many will logically judge, judge a certain value, judge a file, or a directory, we do some action against the result of the judgment, if there is no judgment, there is no way to do some operationsFormat 1:if condition; the
Shell Script Introduction
Shell is a scripting language
The shell has its own syntax, and can use logical judgments, loops, and so on.
Functions can be customized to reduce duplicate code
The shell is a collection of system commands
What is a q:1 shell script and is it required?A: A shell script is a text file that contains one or more commands. As a system administrator, we often need to use multiple commands to accomplish a task, and we can add all these commands in a text file (shell
Shell
The shell also has a way of executing commands called batching (Batch), in which the user writes a shell script, which has many commands that allow the shell to execute the commands one at a time without having to hit the command one by one.
Create a script
Linux has many different shells, but we usually use Bash (Bourne again shell) for shell programming, because Bash is free and easy to use. So in this article, all the scripts provided by the author use Bash (but in most cases, these scripts can also be run in Bash's big sister, Bourne shell ).Like othe
What is a shell?Shell is the command interpreter, is the UNIX operating system user interface, the program from the user interface to get input information, the shell of the user program and its input translated into the operating system kernel (kernel) can recognize the instructions, and the operating system kernel finishes executing the output returned by the
Shell script programming Selection Control Structure
There are two programming languages: interpreted language and compiled language. An interpreted language is an interpreted statement that can be executed on Demand Based on the process control mechanism. When a statement is interpreted, the result of the statement is returned. This language requires an interpreter, bash in linux is such an interpreter. Co
Small Q: A person's career success, only%15 is due to his professional skills, the other%85 to rely on his interpersonalRelationship. The technique of the world, soft and hard relative, professional technology is a strong skill, and based on the processing of interpersonalThe communicative skill of the department is the soft skill---carnegie.One: Introduction Two: Shell script format three:
Shell script programming and file system RepairGuideThe Linux Foundation has initiated the LFCS certification (Linux Foundation Certification System Administrator) Linux Foundation Certified Sysadmin, which is a brand new certification system, the certification aims to enable people from all over the world to take the basic management operations of medium-level Linux systems. The certification includes: mai
Scripting is essential for Linux testing, and the name of the shell script can be arbitrarily defined, and no suffix, such as the name can be written abc,smartzip, as long as the runtime typeThe./smartzip will be able to run the script.Do not use spaces at the beginning of each command line.Part 1th. Basics of writing Linux scripts1.1 Basic Introduction to grammar1.1.1 OpeningThe program must start with the
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