为什么bash的＆QUOT;回声[T]＆QUOT;导致＆QUOT; T＆QUOT;不＆QUOT; [T]＆QUOT;

问题描述

此情况用于字符t和的值根。令人困惑

  $回声[S]
[S]
$回声[T]
ŧ
$回声[T]
[T]
$回声[根]
ŧ
 

解决方案

作为一个没有外壳常客（并不愿意成为），我发现令人惊讶的扩展名是如何设计的时候没有找到匹配的行为。我会报告

The good news is this thing is configurable. The bad one is a script can fail in a number of ways one doesn't expect - at least, I did not, and it took me some time to understand why echo behaves the way you posted, just to find that it's because of a combination of weird filenames (who ever wants to name a file t?), hidden configuration (nullglob disabled, default option but still hidden) and a harmless command.

I said harmless because this is what you get, for example, when the target is ls (a failure because the file is not found):

raffaele@Aldebaran:~$ mkdir test
raffaele@Aldebaran:~$ cd test
raffaele@Aldebaran:~/test$ touch t
raffaele@Aldebaran:~/test$ ls [t]
t
raffaele@Aldebaran:~/test$ ls [v]
ls: cannot access [v]: No such file or directory

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