Bash 函数退出时陷入陷阱

Question

在 bash 中是否可以在函数退出时调用一些命令。我的意思是：

function foo
{
    # something like this maybe?
    trap "echo \"exit function foo\"" EXIT

    # do something
}

foo

我想打印出退出函数 foo。

Answer 1

是的，你可以设陷阱 RETURN :

$ function foo() {
>   trap "echo finished" RETURN
>   echo "doing some things"
> }
$ foo

会显示

doing some things
finished

来自 man bash 对 trap 内置函数的描述：

If a sigspec is RETURN, the command arg is executed each time a shell function or a script executed with the . or source builtins finishes executing.

Answer 2

关于使用 Ctrl+c 退出（不声明另一个退出函数）：

#!/bin/bash
function do_stuff() {
  function do_stuff_end() {
    # the code for exiting the function here
    echo "<the code for exiting the function here>"
    unset -f do_stuff_end
    trap "$trap_sigint" SIGINT
    return
  }
  trap_sigint="$(trap -p SIGINT)"
  trap "do_stuff_end; return" SIGINT
  # the code for the function here
  echo "<the code for the function here>"
  do_stuff_end
}

N.B.: 前面的代码“只是”工作但需要通过考虑 SIGINT

以外的其他信号的影响来改进

Bash 函数退出时陷入陷阱

Bash trap on exit from function

bash

function

exit