[Bash] Understand and Use Functions in Bash

发布时间：2020-12-15 23:07:54 所属栏目：安全来源：网络整理

导读：n this lesson,we‘ll go over how bash functions work. Bash functions work like mini bash scripts--you can pass parameters and invoke them just like a bash command. You can also define local variables within a bash function using the? local

n this lesson,we‘ll go over how bash functions work. Bash functions work like mini bash scripts--you can pass parameters and invoke them just like a bash command. You can also define local variables within a bash function using the?local?keyword. Local variables follow similar scope rules present in most programming languages.

Define and call a function:

//script.sh

greet() {
  echo "hello world" } greet // call a function

Pass parameters to the function:

greet() {
  echo "$1 world"
}

greet  "hello"

$1: means the first param passed in to the function.

Get the return value:

greet() {
  return "$1 world"
}

greet "Hello"

greeting = $(greet "Hello")

$(): get the return as a result.

Global vs local variables:

global = 123

test() {
  echo "global = $global"
  local local_var = "i am a local"
  echo "local_var = $local_var"
}

（编辑：李大同）

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