In this example, we have two variables, ‘a’ and ‘b’. The script checks if ‘a’ is equal to ‘b’. If it’s not, it moves on to the ‘elif’ statement to check if ‘a’ is greater than ‘b’. If neither condition is met, it executes the ‘else’ statement, which in t...
echo "This script needs at least $MINPARAMS command-line arguments!" fi echo exit 0 运行代码: bash test30.sh 1 2 10 The name of this script is "test.sh". The name of this script is "test.sh". Parameter #1 is 1 Parameter #2 is 2 --- All the command-line parameters are: 1 ...
./my_script.sh arg1 arg2 在脚本中,你可以使用$1来代表第 1 个参数,用$2来代表第 2 个参数,以此类推。$0是一个特殊变量,它代表正在运行的脚本的名字。 现在,创建一个新的 shell 脚本,命名为arguments.sh,并向其中添加以下几行代码: #!/bin/bash echo "Script name is: $0" echo "First argument i...
Conditions in bash scripting (if statements) - Linux Academy Blog https://linuxacademy.com/blog/linux/conditions-in-bash-scripting-if-statements/ Table of conditions The following table list the condition possibilities for both the single- and the double-bracket syntax. Save a single exception, th...
$ cat>>script.sh #!/bin/bash echo"hello world"$ bash script.sh hello world 1. 2. 3. 4. 5. 那么,为什么我们需要 Shell 脚本呢?因为你不必一遍又一遍地输入同一个命令,你只需运行 Shell 脚本即可。 此外,如果你的脚本中有复杂的逻辑,把所有的命令都输入到终端中可能并不是一个好主意。
Bash 脚本写在一个扩展名为.script的文件中。尽管 Linux 是一个无扩展的操作系统,但将此扩展添加到你的 bash 脚本中是一种很好的编程约定。 以下命令的功能是创建一个新文件。 vim myscript.sh 执行此命令后,将创建一个名为myscript.sh的文件并在vim编辑器中打开。下面是每个 bash 脚本的第一行。
/bin/bashLINE=1whileread CURRENT_LINEdoecho"${LINE}: $CURRENT_LINE"((LINE++))done < /etc/passwd# This script loops through the file /etc/passwd line by line 退出状态码,任何一个命令执行完成后都会产生一个退出状态码,范围0-255,状态码可以用来检查...
Hello Worldis the most simple bash script to start with. We will create a new variable calledlearningbashand print out the wordsHello World. First, open a new shell script file with a text editor of your choice: nano hello.sh Paste the following lines into it: ...
echo "This script needs at least $MINPARAMS command-line arguments!" fi echo exit 0 算数运算符 $vim test.sh #!/bin/bash a=10 b=20 val=`expr $a + $b` echo "a + b : $val" val=`expr $a \* $b` echo "a * b : $val" ...
In larger scripts, you might need to process large amounts of data stored in arrays. For instance, you might have a script that reads lines from a file into an array and then processes each line individually. In such cases, knowing how to loop through arrays in Bash is invaluable. ...