如何(终端)从 ruby​​ 脚本文件夹中的 cd [英] How to (terminal) cd in folder from ruby script

问题描述

我想知道是否可以更改我正在执行 ruby​​ 脚本的当前终端目录.

I'd like to know if it's possible to change the current terminal directory from where I'm executing my ruby script.

例如，如果我在终端中从 $HOME 执行脚本，我想在脚本末尾的 $HOME/mydir 中执行 cd.

For example, if I'm executing the script from $HOME in the terminal, I would like to cd in $HOME/mydir at the end of the script.

我尝试了一些方法，但我总是在脚本开始的同一个目录中找到.

I've tried a couple of things, but I'm always finding in the same directorry where the script was started.

我尝试过的事情:

Dir.chdir( mydir )
%[cd mydir]

他们实际上确实改变了目录，但只是在脚本执行的线程中.当脚本结束时，我在终端中的当前位置仍然与启动脚本之前相同.

They actually do change directory, but only in the thread of the script execution. When the script ends, my current location in the terminal is still the same I was before launching the script.

我在 SO 中发现了类似的东西，但它是 Python 相关 和响应似乎是负面的.

I've found something similar in SO, but it's Python-related and response seems negative.

你可能会问为什么?

我目前正在参与一个命令行应用程序(使用 gli)，作为起点，它需要一个项目文件夹.所以我的第一个命令看起来像:

I'm currently involved in a command line application (using gli) which, as starting point, needs a project folder. So my first command looks like:

$ myfoo new project

在当前目录中创建一个名为 project 的新文件夹.现在能够使用我需要的其他命令:

Which creates a new folder with name project in the current directory. Now to be able to work with the other commands I need to:

$ cd project
project$ myfoo domore

所以我只是认为在执行了 myfoo new project 之后在 project 中找到我自己会很好.

So I was simply thinking that it would be nice to found my self in project after having executed myfoo new project.

正如我所担心的，这并不容易(根本不可能).那么如何使用 bash 脚本来执行我想要的 ruby​​ 调用，而不是由 RubyGems 生成的标准文件呢?那可行吗?我傻吗?我应该使用 eval 吗?

As I was afraid, it's not that easy (not possible at all). So what about using a bash script which does the ruby calls that I want, in place of the standard file generated by RubyGems? Is that feasible? Am I foolish? Should I use eval?

感谢您的回答.但恐怕没人能接受.可能问题不是:)

Thanks for the answers. But I'm afraid that no one is acceptable. Probably the question wasn't :).

推荐答案

我怀疑是否有一种直接的方法可以做到这一点.

I doubt there is a straightforward way to do this.

当你从你的登录 shell 启动一个程序时，它在底层执行一个 fork/exec 这意味着一个新的(子)进程被创建(它有自己的环境，比如当前工作目录)并且它是标准输入/输出/错误流与(父)shell 进程相关联.因此，当您的脚本调用 Dir.chdir 时，它会更改脚本(子)进程的当前工作目录，而不是父进程.

When you launch a program from your login shell, underneath the hood it's doing a fork/exec which means a new (child) process is created (which has its own environment, such as current working directory) and it's standard input/output/error streams are associated with the (parent) shell process. So when your script calls Dir.chdir it changes the current working directory for the script (child) process, not the parent.

也许您的脚本可以在退出之前启动一个 新 shell，所以看起来您的终端已经更改了目录.虽然，在退出终端会话之前，您必须退出那个额外的 shell...

Perhaps your script could launch a new shell before it exits, so it looks like your terminal has changed directory. Although, you'd have to exit from that extra shell before exiting your terminal session...

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