By default, every variable in the bash is global and to use the local variable, you have to use the termlocalbefore assigning any value to it. But the question is how you use a global variable to return value in
#!/bin/bash function demo { local local_variable="bash function return value method 1!" echo "${local_variable}" } output=$(demo) echo "${output}" 运行它: $bash t2.sh bash function return value method 1! 该例子首先将变量字符串通过echo命令打印到标准输出流中,之后通过$(表达式)的方式将...
function. To actually return arbitrary values to the caller you must use other mechanisms. The simplest way to return a value from a bash function is to just set a global variable to the result. Sinceall variab -lesin bash are global by defaultthis is easy: functionmyfunc() { myresult='...
$ cat test5b #!/bin/bash # using the echo to return a value function dbl { read -p "Enter a value: " value echo $[ $value * 2 ] } result=$(dbl) echo "The new value is $result" $ ./test5b Enter a value: 200 The new value is 400 $ ./test5b Enter a value: 1000 The...
1. A function is read directly into the shell's memory and stored for later use. Since computer memory is not an issue nowadays, using functions is faster than repeating code. 2. Functions help organize long shell scripts into modular and reusable code blocks. The chunks are easier to devel...
#!/bin/bash my_function () { echo "some result" return 55 } my_function echo $? Copysome result 55 Copy To actually return an arbitrary value from a function, we need to use other methods. The simplest option is to assign the result of the function to a global variable: ~/return_...
Try the following bash script to demonstrate how function variables work in bash: 1. Create a script calledvariable.sh: vim variable.shCopy 2. Add the following code to the script: var1=1 var2=1 change() { echo Inside function
function F_NAME{ 函数体 } F_NAME() { 函数体 } 1. 2. 3. 4. 5. 6. 7. 函数的返回值: 函数的执行结果返回值:代码的输出 函数中的打印语句:echo,print 函数中调用的系统命令执行后返回的结果 执行状态返回值: 最后一次执行的命令状态结果 自定义函数执行状态的返回值:return [0-255] 注意:return与...
Inside the function: Declare local variables 'num1' and 'num2' to store the arguments passed to the function. Calculate the difference between 'num1' and 'num2' and store it in the difference variable. Use "echo" to output the value of 'difference'. ...
local VARIABLE=value 存活时间: 函数执行开始,至函数返回结束; function: 功能 把一段具有独立功能代码封装在一起,并给予命名;后续用到时,可直接通过给定函数名来调用整体代码; 函数作用: 代码重用; 模块化编程; 函数的使用方法: 先定义:编写函数代码