Re: [Help-bash] getting weird output out of 'echo' w/args

[Roman Rakus]

I agree. Other than C or POSIX locales' collations order are not 
specified. It means on some machine it can result in aäáàâbc, where on 
other it can be aäáàâAbBc. Even worse I also saw bad order of file names 
with en_US locales (only US letters), so it is not reliable.

RR

On 05/30/2013 12:25 PM, John Kearney wrote:
> And note, if you do try using globbing, for constructs like [a-z] to work
> as you probably expect, you need to set
> LC_COLLATE=C
> otherwise [a-z] can end up being something like
> [aäáàâbc...  z]
>   which is normally not what was intended.
>
>
> On Thu, May 30, 2013 at 11:15 AM, Roman Rakus <address@hidden> wrote:
>
> > Changing the list to help-bash, I think this belongs here.
> >
> > This is common misconception about filename expansion (globbing). Since
> > globbing is done nearly always (*) people know only about "star" character.
> > The fact is that "star", "question mark" and "opening bracket" (*, ?, [)
> > all have special meaning for globbing. See http://www.gnu.org/software/**
> > bash/manual/bashref.html#**Filename-Expansion<http://www.gnu.org/software/bash/manual/bashref.html#Filename-Expansion>
> >
> > Many times I saw using tr like this:
> > somecommand | tr -s [a-z] ''
> > somecommand | tr -s [:space:] ' '
> >
> > Please note that argument for tr undergo globbing (by bash), because it is
> > not quoted.
> >
> > RR
> >
> > * It's not always, but it is good practise to double-quote variable
> > expansions.
> >
> > On 05/30/2013 10:56 AM, Chris Down wrote:
> >
> > > Pierre is referring to the fact that [i++] is evaluated as a glob by
> > > the shell, the reason it doesn't work is because $i is postincremented
> > > instead of preincremented. You can see what he means here:
> > >
> > > $ shopt -u nullglob
> > > $ i=0
> > > $ while read a[++i]; do
> > >
> > > >       echo "${a[i]}"
> > > > done <<< hello
> > > hello
> > > $ shopt -s nullglob
> > > $ while read a[++i]; do
> > >
> > > >       echo "${a[i]}"
> > > > done <<< hello
> > >
> > > $
> > >
> > >
> > >
> > > On 30 May 2013 16:49, Davide Brini <address@hidden> wrote:
> > >
> > > > On Thu, 30 May 2013 08:53:48 +0300, Pierre Gaston <
> > > > address@hidden>
> > > > wrote:
> > > >
> > > >   Missing quotes around [ ]  can be nasty eg
> > > > > #!/bin/bash
> > > > > shopt -s nullglob # sounds a good idea!
> > > > > .....
> > > > > .....
> > > > > i=0
> > > > > while read a[i++]; do
> > > > >     echo "${a[i]}" #  why oh why nothing is printed!
> > > > > done <<< "hello"
> > > >
> > > > It seems to me this has nothing to do with missing quotes around [ ], or
> > > > I
> > > > don't get what you mean.
> > > >
> > > > --
> > > > D.