Oddity In stty

I can't figure this out. Why does the first pipeline suceed but the second fails?
I'm running an up-to-date Sid.

dlc@muse:~$ fold -w `stty -a | head -1 | awk '{print $7}' | tr -d ';'` < /dev/null
dlc@muse:~$ cat /dev/null | fold -w `stty -a | head -1 | awk '{print $7}' | tr -d ';'`
stty: standard input: Invalid argument
fold: option requires an argument -- w
Try `fold --help' for more information.
dlc@muse:~$

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May the LORD God bless you exceedingly abundantly!

Dave Craig

- - - - - - - - - - - - - - - - - - - -
"'So the universe is not quite as you thought it was.
You'd better rearrange your beliefs, then.
Because you certainly can't rearrange the universe.'"

--from _Nightfall_ by Asimov/Silverberg


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On Sun, 2008-08-31 at 17:35 -0400, David L. Craig wrote:
> I can't figure this out. Why does the first pipeline suceed but the second fails?
> I'm running an up-to-date Sid.
>
> dlc@muse:~$ fold -w `stty -a | head -1 | awk '{print $7}' | tr -d ';'` < /dev/null
> dlc@muse:~$ cat /dev/null | fold -w `stty -a | head -1 | awk '{print $7}' | tr -d ';'`
> stty: standard input: Invalid argument
> fold: option requires an argument -- w
> Try `fold --help' for more information.
> dlc@muse:~$

Well, I figured out a way around it: stty -a </dev/tty
Solaris behaves similarly. I'm surprised this isn't
documented behavior.


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On Sun, 31 Aug 2008, David L. Craig wrote:
> On Sun, 2008-08-31 at 17:35 -0400, David L. Craig wrote:
> > I can't figure this out. Why does the first pipeline suceed but the second fails?
> > I'm running an up-to-date Sid.
> >
> > dlc@muse:~$ fold -w `stty -a | head -1 | awk '{print $7}' | tr -d ';'` < /dev/null
> > dlc@muse:~$ cat /dev/null | fold -w `stty -a | head -1 | awk '{print $7}' | tr -d ';'`
> > stty: standard input: Invalid argument
> > fold: option requires an argument -- w
> > Try `fold --help' for more information.
> > dlc@muse:~$
>
> Well, I figured out a way around it: stty -a </dev/tty
> Solaris behaves similarly. I'm surprised this isn't
> documented behavior.

You can file a wishlist bug against coreutils, asking for the documentation
update...

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"One disk to rule them all, One disk to find them. One disk to bring
them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot
Henrique Holschuh


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