返回 1 与返回 0(用户和程序员) [英] return 1 vs return 0 (user and programmer)

问题描述

我之前看过一些关于返回 1 和返回 0 的帖子，以下是我的理解:

I've seen some previous posts on return 1 and return 0, and here is what I understand:

对于程序的用户(不会看源代码的人)来说，return 1 和 return 0 没有区别.

For the user (someone who won't look at the source code) of the program, there is no distinction between return 1 and return 0.

对于程序员来说，return 1 表示错误，return 0 表示正常执行.

For the programmer, return 1 implies error, and return 0 implies normal execution.

我理解正确吗?

抱歉，我认为这无关紧要，但我是在 main() 的上下文中讨论的.

Hi, sorry, I didn't think this mattered, but I am talking about in the context of main().

推荐答案

程序的退出状态可以是whatever给定程序希望它是[mean].

The exit status of a program can be whatever a given program wants it to be [mean].

虽然大多数程序通过:0=success, 1=error，但其他一些程序做不同的事情.

While most programs get by with: 0=success, 1=error, some others do different things.

来自 POSIX/Unix/Linux 的一些示例:

Some examples from POSIX/Unix/Linux:

true 程序总是以 0 退出.false 程序总是以 1 退出.那么，[学术上] false 失败了吗?

The true program always exits with 0. The false program always exits with 1. So, [academically speaking] did false fail?

cmp 和 diff 程序做了:0=文件匹配，1=文件不同，2=其他 [2 通常意味着被比较的文件之一不存在].

The cmp and diff programs do: 0=files match, 1=files differ, 2=other [2 usually means one of the files being compared does not exist].

rsync 程序有许多 退出代码:0=success, non-zero=error.但是，rsync 失败的原因有很多.因为 rsync 在实时 FS 上工作，所以可以重试一些错误.例如，源上的文件在 rsync 发生时被删除(代码 23 或 24).这可以重试.对于一些超时错误也是如此.

The rsync program has many exit codes: 0=success, non-zero=error. But, there are many ways rsync can fail. Because rsync works on a live FS, some errors can be retried. For example, a file on the source is removed while the rsync is happening (code 23 or 24). This can be retried. Likewise for some timeout errors.

EXIT VALUES
0      Success

1      Syntax or usage error

2      Protocol incompatibility

3      Errors selecting input/output files, dirs

4      Requested action not supported: an attempt was made  to  manipu‐
       late  64-bit files on a platform that cannot support them; or an
       option was specified that is supported by the client and not  by
       the server.

5      Error starting client-server protocol

6      Daemon unable to append to log-file

10     Error in socket I/O

11     Error in file I/O

12     Error in rsync protocol data stream

13     Errors with program diagnostics

14     Error in IPC code

20     Received SIGUSR1 or SIGINT

21     Some error returned by waitpid()

22     Error allocating core memory buffers

23     Partial transfer due to error

24     Partial transfer due to vanished source files

25     The --max-delete limit stopped deletions

30     Timeout in data send/receive

35     Timeout waiting for daemon connection

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