Re: Weird issue, command output unable to pipe or capture

Caching/buffering stderr sounds pretty unfortunate and inconvenient.

On Thu, Apr 19, 2018 at 11:28 AM, Steve Litt <[email protected]>
wrote:

> When using |& to pipe stderr and stdout to the same place, be careful
> not to assume anything about order in the merged stream. Python 3 has
> all sorts of caching so that stderr is outputted later than you'd think
> it would be.
>
> SteveT
>
>
> On Thu, 19 Apr 2018 10:40:11 -0700
> kevin dankwardt <[email protected]> wrote:
>
> > |&  is also handy so that stdout and stderr both go into the pipe.
> >
> > as an example
> >
> > $ strace -e open ls |& grep /lib
> >
> >
> >
> > On Thu, Apr 19, 2018 at 8:53 AM, Robert Freiberger
> > <[email protected]> wrote:
> >
> > > That works!
> > >
> > > So I never knew that you could route the stderr after the > to a
> > > file. I'm going to refresh my knowledge of stdout and stderr but I
> > > was able to capture the output in a variable by using the foo=$(foo
> > > 2>&1). I honestly don't think I've encountered this before.
> > >
> > > Thanks again!
> > >
> > > On Wed, Apr 18, 2018 at 9:07 PM Lister <[email protected]>
> > > wrote:
> > >>
> > >>
> > >> On 04/18/2018 09:01 PM, Robert Freiberger wrote:
> > >> > Hello,
> > >> >
> > >> > I've stumbled across a strange issue and wasn't sure if I'm
> > >> > overlooking something very simple. The problem is at work we
> > >> > have an application written in Ruby which is a wrapper for Chef
> > >> > knife command. It's pretty much taking the Chef environments
> > >> > from our Chef org and building a set of arguments.
> > >> >
> > >> > For example:
> > >> >
> > >> > $ foo dev-stage1 list
> > >> >
> > >> > This would use the Chef knife command to query the hosts in the
> > >> > dev-stage1 environment and list them out. The problem is the
> > >> > output does not allow me to pipe or capture in a bash variable
> > >> > "foo=$(foo dev-stage1 list)". Even something like "$ foo
> > >> > dev-stage1 list > /tmp/foo" doesn't work either.
> > >> Are you sure the command does not output to stderr?
> > >> You may try
> > >> $ foo > /tmp/foo 2>&1
> > >>
> > >> thanks
> > >> K
> > >>
> > > --
> > > Robert Freiberger
> > > 510-936-1210
> > >
> > > _______________________________________________
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> > > [email protected]
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> > >
> > >
> >
> >
>
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