Re: missed backslash after brace expansion {Z..a}

[Andreas Kusalananda Kähäri]

On Sun, Dec 15, 2019 at 05:24:18PM +0300, Andrei Enshin wrote:
> 
> Hello,
> 
> I’m plaing with brace expansion and can observe some strange (it seems to me) 
> behaviour — there is no back slash in the following expansion:
> $ echo {Z..a}
> Z [  ] ^ _ ` a
> 
> however there is an extra space:
> $ echo {Z..a} | xxd
> 00000000: 5a20 5b20 205d 205e 205f 2060 2061 0a    Z [  ] ^ _ ` a.
> 
> 
> I expect baskslash just because the output looks like ascii. I may be wrong. 
> Would be great if someone can explain which alphabet is used instead.
> 
> 
> Documentation says:
> «When characters are supplied, the expression expands to each character 
> lexicographically between x and y, inclusive, using the default C locale»
> https://www.gnu.org/software/bash/manual/bash.html#Brace-Expansion
> 
> 
> What is the reason to have extra space instead of backslash?
>  
> Andrei Enshin

See this *very* recent thread on the bug-bash list:

https://lists.gnu.org/archive/html/bug-bash/2019-12/msg00013.html


-- 
Andreas (Kusalananda) Kähäri
SciLifeLab, NBIS, ICM
Uppsala University, Sweden