Date: Thu, 20 Dec 2007 10:48:40 -0800 From: Chuck Swiger <cswiger@mac.com> To: Mikhail Teterin <mi+kde@aldan.algebra.com> Cc: questions@freebsd.org, "Max N. Boyarov" <m.boyarov@bsd.by> Subject: Re: tail does not exit Message-ID: <7A58A4F6-4F31-4972-8213-4B9406D6A3FF@mac.com> In-Reply-To: <200712200458.27988@aldan> References: <200712192322.lBJNMfps053071@aldan.algebra.com> <200712191906.16254.mi%2Bmill@aldan.algebra.com> <86r6hixiyn.fsf@bsd.by> <200712200458.27988@aldan>
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On Dec 20, 2007, at 1:58 AM, Mikhail Teterin wrote:
> On =D1=81=D0=B5=D1=80=D0=B5=D0=B4=D0=B0 19 =D0=B3=D1=80=D1=83=D0=B4=D0=B5=
=D0=BD=D1=8C 2007, Chuck Swiger wrote:
> =3D A quick test suggests that "tail -f" will close when it gets a =20
> SIGPIPE.
>
> SIGPIPE? How is that relevant? Does tail get a SIGPIPE, when awk =20
> disappears
> in my example? If it does not, why do you bring it up?
tail should get a SIGPIPE when it tries to write to a pipeline where =20
the other end has closed.
> And if it does get SIGPIPE, then you are wrong, because the posted
> "quick test" shows the exact opposite behavior -- tail does NOT go
> away.
>
> Please, clarify... Thanks.
Worked for me. I opened two SSH sessions to a FreeBSD 5.5 system, and =20=
did this in one:
% touch /tmp/logfile
% echo "line 1" >> /tmp/logfile
...and this in the other:
% tail -f /tmp/logfile | awk '{print "Line: " $1 ; exit(0)}END{print =20=
"Bye"}'
...when I then did a:
% echo "line 2" >> /tmp/logfile
...in the first, the tail -f process terminated in the second.
--=20
-Chuck
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