Bash陷阱退出功能

Question

当函数退出时,bash中是否有可能调用某些命令.我的意思是:

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

    # do something
}

foo

我希望打印退出函数foo.

Answer 1

是的,你可以陷阱RETURN:

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

会显示

doing some things
finished

从内置man bash的描述trap:

如果sigspec是RETURN,则每次执行shell函数或脚本时都会执行命令arg.或源内置完成执行.