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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.
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PYTHON-CONFIG(1)					      General Commands Manual						  PYTHON-CONFIG(1)

NAME
python-config - output build options for python C/C++ extensions or embedding SYNOPSIS
python-config [ --prefix ] [ --exec-prefix ] [ --includes ] [ --libs ] [ --cflags ] [ --ldflags ] [ --help ] DESCRIPTION
python-config helps compiling and linking programs, which embed the Python interpreter, or extension modules that can be loaded dynamically (at run time) into the interpreter. OPTIONS
--cflags print the C compiler flags. --ldflags print the flags that should be passed to the linker. --includes similar to --cflags but only with -I options (path to python header files). --libs similar to --ldflags but only with -l options (used libraries). --prefix prints the prefix (base directory) under which python can be found. --exec-prefix print the prefix used for executable program directories (such as bin, sbin, etc). --help print the usage message. EXAMPLES
To build the singe-file c program prog against the python library, use gcc $(python-config --cflags --ldflags) progr.cpp -o progr.cpp The same in a makefile: CFLAGS+=$(shell python-config --cflags) LDFLAGS+=$(shell python-config --ldflags) all: progr To build a dynamically loadable python module, use gcc $(python-config --cflags --ldflags) -shared -fPIC progr.cpp -o progr.so SEE ALSO
python (1) http://docs.python.org/extending/extending.html /usr/share/doc/python/faq/extending.html AUTHORS
This manual page was written by Johann Felix Soden <johfel@gmx.de> for the Debian project (and may be used by others). November 27, 2011 PYTHON-CONFIG(1)
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