本文介绍了在Bash或Shell脚本中转​​发函数声明?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

bash 中是否存在这样的事情,或者至少有类似于前向声明的类似(解决方法),例如C / C ++中众所周知的?

Is there such a thing in bash or at least something similar (work-around) like forward declarations, well known in C / C++, for instance?

或者有这样的事情,因为例如它总是以一次执行(一行一行)?

Or there is so such thing because for example it is always executed in one pass (line after line)?

如果没有前向声明,我应该怎么做才能让我的脚本更易于阅读。这是相当长的,开头的这些函数定义,与全局变量混合在一起,使得我的脚本看起来丑陋难以阅读/理解)?我要求了解一些此类案例的知名/最佳实践。

If there are no forward declarations, what should I do to make my script easier to read. It is rather long and these function definitions at the beginning, mixed with global variables, make my script look ugly and hard to read / understand)? I am asking to learn some well-known / best practices for such cases.

例如:

# something like forward declaration
function func

# execution of the function
func

# definition of func
function func
{
    echo 123
}


推荐答案

好的问题。对于我的大部分脚本,我都使用这种模式:

Great question. I use a pattern like this for most of my scripts:

#!/bin/bash

main() {
    foo
    bar
    baz
}

foo() {
}

bar() {
}

baz() {
}

main "$@"

您可以从上至下阅读代码,但直到最后一行才会开始执行。通过将$ @传递给main(),您可以访问命令行参数 $ 1 $ 2 ,等等。就像你平常那样。

You can read the code from top to bottom, but it doesn't actually start executing until the last line. By passing "$@" to main() you can access the command-line arguments $1, $2, et al just as you normally would.

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08-22 18:20