tr: trying to find the right incantation of a character class...

[Cristian Ionescu-Idbohrn]

On Tue, 29 Aug 2017, Olivier Brunel wrote:
> On Tue, 29 Aug 2017 19:23:39 +0200 (CEST)
> Cristian Ionescu-Idbohrn <cristian.ionescu-idbohrn at axis.com> wrote:
> 
> > ...to do this:
> > 
> > $ echo 'hello world-1' | tr -d '[ -]'
> > 
> > that is, remove all SPACES (0x20) and dashes (0x2D) in input?  I get 
> 
> echo 'hello world-1' | tr -d -- ' -'
> 
> > mixed results with both various versions of busybox but also with the 
> > coreutils `tr' and the characters order placed in the character class.
> > 
> > `man 7 regex' is telling us:
> 
> SETs in tr(1) aren't actually regex, so this doesn't apply. As shown
> above, simply list the characters you wanna delete.
> 
> `man tr` tells us:
> 
> 	SETs  are  specified  as  strings  of characters.  Most
> 	represent themselves.

Thanks a lot for putting me on the right track ;)


Cheers,

-- 
Cristian