无法解释 sort(1) 行为

Question

当我看到ls以奇怪的顺序列出以下文件时，我一直对此感到困惑：

Star Wars Episode II - Attack of the Clones (2002) BDRip.mkv
Star Wars Episode III - Revenge of the Sith (2005) BDRip.mkv
Star Wars Episode I - The Phantom Menace (1999) BDRip.mkv
Star Wars Episode IV - A New Hope (1977) BDRip.mkv
Star Wars Episode VI - Return of the Jedi (1983) BDRip.mkv
Star Wars Episode V - The Empire Strikes Back (1980) BDRip.mkv

从人类的角度来看，“I”应该先走，然后是“II”，依此类推。

所以我创建了包含以下内容的文件：

$ cat 1
Star Wars Episode II - Attack
Star Wars Episode III - Revenge
Star Wars Episode I - The
Star Wars Episode IV - A
Star Wars Episode VI - Return
Star Wars Episode V - The

如果我对它进行排序，它会给我这个：

$ sort 1
Star Wars Episode II - Attack
Star Wars Episode III - Revenge
Star Wars Episode I - The
Star Wars Episode IV - A
Star Wars Episode VI - Return
Star Wars Episode V - The

但是，如果我删除“-”以及排序正确后的所有内容：

$ cat 1
Star Wars Episode II 
Star Wars Episode III 
Star Wars Episode I 
Star Wars Episode IV 
Star Wars Episode VI 
Star Wars Episode V 

$ sort 1
Star Wars Episode I 
Star Wars Episode II 
Star Wars Episode III 
Star Wars Episode IV 
Star Wars Episode V 
Star Wars Episode VI 

所以，只要我在空格后添加任何符号，它就会开始对我来说不可预知的排序：

$ cat 1
Star Wars Episode II y
Star Wars Episode III x
Star Wars Episode I z
Star Wars Episode IV w
Star Wars Episode VI v
Star Wars Episode V u

$ sort 1
Star Wars Episode III x
Star Wars Episode II y
Star Wars Episode IV w
Star Wars Episode I z
Star Wars Episode VI v
Star Wars Episode V u

关于这种排序行为的任何提示？

更新：排序：使用‘en_CA.UTF-8’排序规则

update #2 根据下面的评论，这是因为语言环境。

ls | LANG=C sort
Star Wars Episode I - The Phantom Menace (1999) BDRip.mkv
Star Wars Episode II - Attack of the Clones (2002) BDRip.mkv
Star Wars Episode III - Revenge of the Sith (2005) BDRip.mkv
Star Wars Episode IV - A New Hope (1977) BDRip.mkv
Star Wars Episode V - The Empire Strikes Back (1980) BDRip.mkv
Star Wars Episode VI - Return of the Jedi (1983) BDRip.mkv

为什么 UTF8 语言环境让它与众不同？ 我检查了 ru_RU.UTF8（排序错误）和 ru_RU.KOI8-R（正确排序）

更新#3关于语言环境：http://www.gnu.org/software/coreutils/faq/#Sort-does-not-sort-in-normal-order_0021

Answer 1

我想我找到了正确的解释：

Gnu coreutils FAQ: Sort does not sort in normal order

找到它：sort not sorting as expected (space and locale)

Answer 2

在使用基于语言环境的排序时，它会忽略所有非字母数字字符：

II - Attack   -> "IIA"
III - Revenge -> "III"
I - The       -> "ITh"
IV - A        -> "IVA"
VI - Return   -> "VIR"
V - The       -> "VTh"

使用LC_ALL=C，空格字符排在字母数字前面：

I - The       -> "I -"
II - Attack   -> "II "
III - Revenge -> "III"
IV - A        -> "IV "
V - The       -> "V -"
VI - Return   -> "VI "

所以这是巧合，但它需要 30 多部电影才能真正失败。