退出函数时的 Bash 陷阱

Question

bash 中是否可以在函数退出时调用某些命令。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，你可以捕获 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 内建函数的描述:

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.