read variable_name 其中,variable_name是你自定义的变量名,用于保存用户输入的值。读取用户输入后,可以通过该变量名来获取输入的内容。 以下是获取用户输入的完整示例代码: 代码语言:txt 复制 #!/bin/bash echo "Please enter your name: " read name echo "Hello, $name! How are
The following script has 4 values, 3 of them being strings. In our example, we will extract only the number value. This can be done via thecutcommand. First, we instruct the command that each variable is separated by a comma by using the-dflag. Then we ask the cut command to extract...
Here is our first bash shell script example: #!/bin/bash # declare STRING variable STRING="Hello World" #print variable on a screen echo $STRING Navigate to a directory where your hello_world.sh is located and make the file executable: $ chmod +x hello_world.sh Now you are ready to ...
Usually, a Bash script file is.shextension, which indicates that the file is a shell script. However, when the file starts with "she-bang" or "hashbang", we can execute it like a binary file. When creating scripts, we should take into account that every binary shell file starts with w...
echo "With standard input you have told me your name is: $name" 这个示例通过标准输出给出提示,提醒用户输入信息,然后从标准输入(键盘)获取信息,使用 read 将其存储在 name 变量中,并通过标准输出显示出 name 中的值。 [zexcon@fedora ~]$ ./learnToScript.sh Please enter your name. zexcon With ...
Furthermore, we can use the "read" keyword and a variable to store the given name through the terminal. #!/bin/bash echo "Inputs and outputs" echo "Hi, Im jhon, What is your name ?" read name echo "Nice to meet you $name!" echo "* end of script *" The following is the ...
However, if you want to execute a different command if the condition is false, add an else statement to the script and follow it with the command.Let’s take a look at simple if, then, and else statements. Before the statement, we will include a variable so the user can input a ...
[root@script ~]# string='hello chencer' [root@script ~]# echo $string hello chencer [root@script ~]# echo ${string:2:4} llo [root@script ~]# echo ${string: -2} er 1. 2. 3. 4. 5. 6. 7. 取子串:基于模式; ${variable#*word}:在variable中存储字串上,自左而右,查找第一次...
如果与其他人分享你的脚本,注释也将帮助他们理解思考过程,以及更好理解你的脚本实现的功能。想一想上篇文章中的数学方程,我们在新版脚本中添加了一些注释。注意,在 learnToScript.sh 文件(如下所示)中,注释是前面带有 # 号的行。当脚本运行时,这些注释行并不会出现。
其次,Shell 是一个命令解释器,解释用户输入的命令。它支持变量、条件判断、循环操作等语法,所以用户可以用 Shell 命令写出各种小程序,又称为脚本(script)。这些脚本都通过 Shell 的解释执行,而不通过编译。 最后,Shell 是一个工具箱,提供了各种小工具,供用户方便地使用操作系统的功能。