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Re: Backslash missing in brace expansion


From: Chet Ramey
Subject: Re: Backslash missing in brace expansion
Date: Thu, 5 Dec 2019 12:01:31 -0800
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.9.1

On 12/5/19 11:11 AM, Martin Schulte wrote:
> Hello,
> 
> please have a look:
> 
> $ uname -a
> Linux martnix4 4.9.0-11-amd64 #1 SMP Debian 4.9.189-3+deb9u2 (2019-11-11)
> x86_64 GNU/Linux $ echo ${BASH_VERSINFO[@]}
> 4 4 12 1 release x86_64-pc-linux-gnu
> $ set -x
> $ echo {Z..a}
> + echo Z '[' '' ']' '^' _ '`' a
> Z [  ] ^ _ ` a
> 
> It looks as if the backslash (between [ and ] in ASCII code) is missing in
> brace expansion. The same behaviour seems to be found in bash 5.0.

It's an unquoted backslash, which is removed by quote removal when the
words are expanded. Look at the extra space between `[' and `]'; that's
the null argument resulting from the unquoted backslash.


-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://tiswww.cwru.edu/~chet/



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