Re: [PLUG] Splitting strings in bash

[Walt Mankowski via plug <plug@lists.phillylinux.org>]

Thanks! I was suspecting something like that. It makes sense after I
thought about it for a bit.

On Wed, Apr 26, 2023 at 03:57:43PM -0400, Carlos M. Fernández via plug wrote:
> The first example with the pipe puts the read command in a subshell, and
> that environment gets wiped out after the line is executed, taking the
> updated variable values with it. The one with the here string doesn't,
> allowing the read to modify the environment in the script.
> 
> 
> On Wed, Apr 26, 2023, 15:46 Walt Mankowski via plug <
> plug@lists.phillylinux.org> wrote:
> 
> > Hi all,
> >
> > I've got a question about splitting strings in a bash shell
> > script. Let's say I've got a string
> >
> > STR='dog cat'
> >
> > I'd like to split that on the space into two variables, foo and bar. I
> > tried this
> >
> > echo $STR | read foo bar
> >
> > but it doesn't work. On the following line foo and bar are back to
> > their original values. Then, after looking through the bash manpage
> > for an alternative, I tried this instead
> >
> > read foo bar <<< $STR
> >
> > That DID work!
> >
> > So that solves my problem, but I'm still confused. Those two commands
> > seem to me like they should be identical. Why doesn't the first one work?
> >
> > Walt
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> ___________________________________________________________________________
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