/bin/bash# Shebang line: Indicates the path to the shell interpreter (in this case, bash)# Prompt the user to enter a numberecho"Input a number:"readn# Check if the number is greater than 100if["$n"-gt100];thenecho"The number is greater than 100."elseecho"The number is not greate...
在Terminal中输入 展示shell内的所有变量 declear -p 定义自己的变量 declear myvariable declear myvariable=22 declear myvariable=11 声明限制变量 #! /bin/bash declear -r pwdfile=/etc/passswd echo $pwdfile pwdfile=/etc/abc.txt echo $pwdfile 12. Arrays #! /bin/bash car=('BMW' 'Toyota'...
Knowing how conditionals work in bash open up a world of scripting possibilities. We’ll learn the basic syntax, including if, else, and elif. Then we'll look at a few of the "primary" operators you can leverage in a conditional statement such as = for string equality, -eq for numeric...
In this tutorial, we explain how to use the if statement in Bash to make scripts more interactive. We start with a simple example that shows how conditional statements work, then move on to examples of different ways to work with conditions in shell scripts....
Bash conditional statements perform different computations or actions depending on whether a programmer-specified boolean condition evaluates to true or false. These statements are used to execute different parts of your shell program depending on whether certain conditions are true. The ability to branch...
该语法来自 Korn shell,也可用于 zsh 和 bash。不过,与此处的标准 [ 实用程序相比,它的优势有限。 常规文件(由-f检查)和目录只是许多不同类型的文件中的两种。还有套接字、符号链接、设备、fifos、门... [ -e 将测试文件是否存在(任何类型,包括常规、fifo、目录...)在符号链接解析后。 @StephaneChazel...
To fully grasp the power of ‘else if’ in bash scripting, it’s essential to understand the fundamentals of bash scripting, conditional statements, and flow control. What is Bash Scripting? Bash (Bourne Again SHell) is a command-line interpreter, or shell, for the Linux operating system. ...
All the codes in this article are written in Bash. It will only be runnable in the Linux Shell environment. Author:MD Aminul Islam Aminul Is an Expert Technical Writer and Full-Stack Developer. He has hands-on working experience on numerous Developer Platforms and SAAS startups. He is highl...
2. Simple Backup bash shell script #!/bin/bash tar -czf myhome_directory.tar.gz /home/linuxconfig 3. Variables In this example we declare simple bash variable and print it on the screen ( stdout ) with echo command. #!/bin/bash ...
Create and run your first bash shell script Use variables Pass arguments and accept user inputs in your bash scripts Perform mathematical calculations Manipulate strings Use conditional statements like if-else Use for, while and until loops