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Re: non-blocking stdin from bash

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On Sun, 2018-08-12 at 00:48 +0200, tomas@tuxteam.de wrote:
> On Sat, Aug 11, 2018 at 06:08:34PM -0400, Jim Popovitch wrote:
> > Hello!
> > 
> > What's the best way to grab anything that's in stdin into a
> > variable
> > inside a bash script, but won't block if stdin is null?
> 
> I think read is your friend (at least in bash). It has an option
> -t <timeout>, which you can set to zero, for it to just grab what's
> available at the moment without waiting (cf "help read" while in
> the bash for more details, like setting a delimiter, etc.)
> 
> HTH
> -- tomás

Thanks for the reply tomás.  I'm trying to avoid using read because of
the 1 sec minimum timeout.  This may seem odd, but 1 sec is 100+ times
longer than grep'ing/awk'ing/sed'ing the contents of a variable, so I'm
trying to find a faster way to read stdin.  

-Jim P.

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non-blocking stdin from bash Jim Popovitch <jim@k4vqc.com> - 2018-08-12 00:10 +0200
  Re: non-blocking stdin from bash <tomas@tuxteam.de> - 2018-08-12 00:50 +0200
    Re: non-blocking stdin from bash Jim Popovitch <jim@k4vqc.com> - 2018-08-12 07:30 +0200
      Re: non-blocking stdin from bash <tomas@tuxteam.de> - 2018-08-12 10:40 +0200
        Re: non-blocking stdin from bash Jim Popovitch <jim@k4vqc.com> - 2018-08-12 18:40 +0200
          Re: non-blocking stdin from bash <tomas@tuxteam.de> - 2018-08-12 19:50 +0200
            Re: non-blocking stdin from bash Jim Popovitch <jim@k4vqc.com> - 2018-08-12 20:00 +0200
              Re: non-blocking stdin from bash <tomas@tuxteam.de> - 2018-08-12 22:00 +0200
              Re: non-blocking stdin from bash Richard Hector <richard@walnut.gen.nz> - 2018-08-13 00:20 +0200
                Re: non-blocking stdin from bash Jim Popovitch <jim@k4vqc.com> - 2018-08-13 00:50 +0200
                Re: non-blocking stdin from bash Greg Wooledge <wooledg@eeg.ccf.org> - 2018-08-13 15:00 +0200
                Re: non-blocking stdin from bash Jim Popovitch <jim@k4vqc.com> - 2018-08-13 16:40 +0200
                Re: non-blocking stdin from bash Greg Wooledge <wooledg@eeg.ccf.org> - 2018-08-13 16:50 +0200
                Re: non-blocking stdin from bash Jim Popovitch <jim@k4vqc.com> - 2018-08-13 17:00 +0200
                Re: non-blocking stdin from bash Dan Purgert <dan@djph.net> - 2018-08-13 17:10 +0200
                Re: non-blocking stdin from bash Greg Wooledge <wooledg@eeg.ccf.org> - 2018-08-13 17:10 +0200
                Re: non-blocking stdin from bash Dan Purgert <dan@djph.net> - 2018-08-13 17:30 +0200
                Re: non-blocking stdin from bash Richard Hector <richard@walnut.gen.nz> - 2018-08-14 08:10 +0200

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