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Full Discussion: Soft kill a process to redirect the last kbytes output to a file
Top Forums Shell Programming and Scripting Soft kill a process to redirect the last kbytes output to a file Post 302952542 by Corona688 on Wednesday 19th of August 2015 04:45:35 PM
Old 08-19-2015
Quote:
Originally Posted by Mastaer
thank you jim mcnamar,

but the problem is not the python script. it is ok to hard kill the python script.
It doesn't hurt the script or your system to hard-kill it, no -- but it certainly doesn't do what you want.

Python does single writes every 4096 bytes because this more efficient than doing 50 tinier writes. Python streams do this on the assumption the stream will end naturally, not get hard-killed while waiting for the 4096th byte. This is not a shell thing, a redirection thing, or any kind of system buffer -- the buffer is in Python, part of Python's code, controlled by Python, and must be configured in Python to disable Python's write buffer.

This is not the same as system disk cache, that's transparent, you'd see a correct result if the system knew it was supposed to be there.

This is not the same as the buffers used for pipes. Those don't apply when not using pipes.

You cannot force Python or any other program to not buffer from the outside, unless there's some mysterious NEVER_BUFFER environment variable Python responds to or something.
This User Gave Thanks to Corona688 For This Post:
Mastaer
 

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LEARN ABOUT DEBIAN

lp-shell

lp-shell(1)						      General Commands Manual						       lp-shell(1)

NAME

       lp-shell - Open an interactive launchpadlib shell.

SYNOPSIS

       lp-shell [-a] [-cPROGRAM] [--python] [--ipython] [service] [LP API version]

DESCRIPTION

       lp-shell opens an interactive Python shell with a launchpadlib.Launchpad object "lp" which is ready for use.

       It  authenticates against Launchpad with the consumer name "udt-lp-shell". When using lp-shell with the -a option it will use the anonymous
       login from launchpadlib.Launchpad.

       By default lp-shell connects to the "production" Launchpad service using the "1.0" LP API version.

       If you want to connect to another Launchpad service, call lp-shell with the service name as the second argument. lp-shell supports all ser-
       vices known by launchpadlib Python module.  Currently known are (list can be incomplete or outdated): "production", "staging", "dogfood".

       A  different  LP  API version can be selected by passing the API version to use as the third argument. Current supported are: "beta", "1.0"
       and "devel".

OPTIONS

       -a     Login anonymously into Launchpad.

       -c PROGRAM
	      Don't enter a shell but only run the specified Python program and exit.

       --ipython
	      Use an ipython shell if available (default).

       --python
	      Use a regular python shell.

AUTHORS

       lp-shell was written by Martin Pitt <martin.pitt@ubuntu.com>.

       It is released under the terms of the GNU General Public License, version 2 or (at your option) any later version.

lptools 							   27 March 2010						       lp-shell(1)
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