如何停止脚本执行可能已经采购或直接执行 [英] How to stop execution in script which may have been sourced or directly executed

问题描述

如果我的脚本获取与采购

If my script gets sourced with

. ./my_script.sh
source ./my_script.sh

然后在脚本停止执行，我会使用收益。

如果我的脚本直接与执行

If my script is directly executed with

./my_script.sh
bash ./my_script.sh

然后我会插入一个退出。

如果我不知道用户是否会采购或直接执行它，我怎么能干净地停止脚本，而不杀死它是由被称为终端？

preferably中，code段应能够终止，即使它被放在里面的脚本的功能之一的脚本。

Preferably, the code snippet should be able to terminate the script even if it were placed inside one of the script's functions.

推荐答案

请尝试以下操作：

ec=0 # determine the desired exit code

return $ec 2>/dev/null || exit $ec

收益会成功，如果脚本正在来源，否则退出将一命呜呼了 2 - ;的/ dev / null的燮$ p $的情况下，psses错误消息剧本的不的来源

return will succeed if the script is being sourced, otherwise exit will kick in. The 2>/dev/null suppresses the error message in case the script is not sourced.

净效果是，该脚本将与所需的退出/返回code终止，不管它是否被源或不

The net effect is that the script will terminate with the desired exit / return code, regardless of whether it was sourced or not.

更新：在OP希望能够从的退出脚本中的一个函数的内部脚本

Update: The OP wants to be able to exit the script from inside a function within the script.

我能想到的唯一的办法是为将所有脚本的code在一个的子shell 的并调用退出从子shell里面的功能在里面;然后将回报2 - ;的/ dev / null的||退出命令的之后的子shell（作为子shell之外唯一语句）：

The only way I can think of is to place all of your script's code in a subshell and call exit from inside the functions inside that subshell; then place the return 2>/dev/null || exit command after the subshell (as the only statement outside the subshell):

#!/usr/bin/env bash

( # subshell to place all code in

  foo() {
    exit 1  # exit the subshell
  }

  foo # invoke the function

)

# Terminate script with exit code from subshell.
ec=$?; return $ec 2>/dev/null || exit $ec

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