在特使中使用rm *(通配符):无此类文件或目录 [英] Using rm * (wildcard) in envoy: No such file or directory

问题描述

我正在使用Python和Envoy.我需要删除目录中的所有文件.除某些文件外，该目录为空.在终端中，这将是:

I'm using Python and Envoy. I need to delete all files in a directory. Apart from some files, the directory is empty. In a terminal this would be:

rm /tmp/my_silly_directory/*

常识规定，在特使中，这可以翻译为:

Common sense dictates that in envoy, this translates into:

r = envoy.run('rm /tmp/my_silly_directory/*')

但是:

r.std_err -> "rm: cannot remove `/tmp/my_silly_directory/*': No such file or directory"

在这种情况下，自然有使用envoy的替代方法，我只是想知道为什么它不起作用.

Naturally there are alternatives to using envoy in this case, I am simply wondering why it doesn't work.

有任何线索吗?

推荐答案

在UNIX上，由外壳程序解释诸如*之类的通配符.如果执行程序并将参数中带有*的参数直接传递给程序(这大概是在此处执行的操作)，那么您将看到错误，就像看到的一样. rm仅假定*是文件名，实际上，实际上可以创建这样的文件.

On UNIX, it's up to the shell to interpret wildcards like *. If you execute a program and pass an argument with * in it directly to the program -- which is presumably what's being done here -- then you'll get an error like you're seeing. rm just assumes the * is a file name, and indeed, it's actually possible to create such a file.

一种解决方案可能是执行shell，并让它代表您执行命令，例如

One solution could be to execute the shell and let it execute your command on your behalf, something like

r = envoy.run('sh -c "rm /tmp/my_silly_directory/*"')

shell将在调用rm之前解释*.

The shell will interpret the * before invoking rm.

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