On Dec 20, 2007, at 1:58 AM, Mikhail Teterin wrote:
On середа 19 грудень 2007, Chuck Swiger wrote:
= A quick test suggests that "tail -f" will close when it gets a
SIGPIPE.
SIGPIPE? How is that relevant? Does tail get a SIGPIPE, when awk
disappears
in my example? If it does not, why do you
четвер 20 грудень 2007 11:58 до, Erik Osterholm Ви написали:
> Ah, I see. With very, very long lines, tail doesn't send the output
> all at once. The cutoff seems to be 65536 bytes on my system.
They don't even have to be very very long -- unless in an artificial example,
such as the one I poste
On Thu, Dec 20, 2007 at 11:02:59AM -0500, Mikhail Teterin wrote:
> On ?? 20 ??? 2007, Erik Osterholm wrote:
> = The same behavior happens if I use a larger file. I see no
> = inconsistent behavior, nor any bugs.
>
> The inconsistency is in the fact, that the behavior depends on the size o
On Thu, Dec 20, 2007 at 05:40:11AM -0500, Mikhail Teterin wrote:
> On ?? 20 ??? 2007, Max N. Boyarov wrote: = | MT> Is not that
> a bug in itself? = = | Tail write buffer at all, i.e. all 10 lines
> writes to pipe.
>
> So, the behavior depends on the size of the buffer -- and thus the
> si
On четвер 20 грудень 2007, Erik Osterholm wrote:
= The same behavior happens if I use a larger file. I see no
= inconsistent behavior, nor any bugs.
The inconsistency is in the fact, that the behavior depends on the size of the
buffer and length of the lines (not the size of the file).
If the 1
On четвер 20 грудень 2007, Max N. Boyarov wrote:
= MT> Is not that a bug in itself?
=
= Tail write buffer at all, i.e. all 10 lines writes to pipe.
So, the behavior depends on the size of the buffer -- and thus the size of the
input lines.
A bug indeed...
-mi
> "MT" == Mikhail Teterin writes:
MT> On четвер 20 грудень 2007, Max N. Boyarov wrote:
MT> = after something writeln to /var/log/messages tail get SIGPIPE
MT> But why is that needed for tail to notice? It is trying to output 10 lines.
MT> After it outputs the very first one of them, aw
On четвер 20 грудень 2007, Max N. Boyarov wrote:
= after something writeln to /var/log/messages tail get SIGPIPE
But why is that needed for tail to notice? It is trying to output 10 lines.
After it outputs the very first one of them, awk exits, and the 9 subsequent
lines go into thin air /withou
> "MT" == Mikhail Teterin writes:
[...]
MT> I'm sorry, this does not make sense to me. Starting with an empty
MT> file, as you do in 1), /may/ make tail not notice, that awk went
MT> away, because tail has nothing to write to stdout.
MT> But /var/log/messages is not empty, and awk -
On середа 19 грудень 2007, Chuck Swiger wrote:
= A quick test suggests that "tail -f" will close when it gets a SIGPIPE.
SIGPIPE? How is that relevant? Does tail get a SIGPIPE, when awk disappears
in my example? If it does not, why do you bring it up?
And if it does get SIGPIPE, then you are wron
On Dec 19, 2007, at 4:06 PM, Mikhail Teterin wrote:
Josh Tolbert:
Cause the -f option to tail doesn't work that way. -f always waits
for more
input.
I know very well about -f waiting for more *input*. What puzzles me,
is that
tail does not quit, when its *output* is closed.
James Harriso
> "MT" == Mikhail Teterin writes:
MT> Max N. Boyarov:
>> -f The -f option causes tail to not stop when end of file is
>> reached, but rather to wait for additional data to be appended
>> to the input. The -f option is ignored if the standard input is a pipe,
>>
Max N. Boyarov:
> -f The -f option causes tail to not stop when end of file is
> reached, but rather to wait for additional data to be appended
> to the input. The -f option is ignored if the standard input is a pipe,
> but not if it is a FIFO.
Josh Tolbert:
> Cause the -f
> "MT" == Mikhail T. writes:
MT> Why does not the script below actually ever exit?
MT> #!/bin/sh
MT> if tail -f /var/log/messages | awk '{print "Exiting"; exit 0}'
MT> then
MT> echo Exited
MT> else
MT> echo Failed
MT>
James Harrison writes:
> tail -f holds on for dear life until a ctrl-c happens. IT HAS A
> DEATH GRIP!
Agreed.
Robert Huff
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On Wed, 2007-12-19 at 18:22 -0500, Mikhail T. wrote:
> #!/bin/sh
>
> if tail -f /var/log/messages | awk '{print "Exiting"; exit 0}'
> then
> echo Exited
> else
> echo Failed
> fi
>
> exit 0
I assume it has something
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