Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: [solved] How to see log in real time?
Top Forums Shell Programming and Scripting [solved] How to see log in real time? Post 302827757 by Tieso on Sunday 30th of June 2013 03:31:43 PM
Old 06-30-2013
Quote:
Originally Posted by Don Cragun
It looks like python is buffering output so there is no external way to view the results until python flushes its output buffer. Normally this will happen when the buffer fills and when python closes the output file. If you have permission to change the python source file (example.py), consider adding flush() calls to appropriate spots in the code so tail will be able to see data written to the file after significant updates are written.
Thank you very much, this is the problem!
It can be solved adding a flush() method after the prints you want to flush:
Code:
import sys
sys.stdout.flush()

Adding a flush() class like this:
Code:
class flushfile(object):
    def __init__(self, f):
        self.f = f
    def write(self, x):
        self.f.write(x)
        self.f.flush()

import sys
sys.stdout = flushfile(sys.stdout)

Or more easily adding -u option when invoke python:
Code:
python -u example.py >> log &

then with tail command see any print in real time:
Code:
tail -f logfile

Thanks a lot
Solved
Last edited by Tieso; 06-30-2013 at 04:48 PM.. Reason: I don't see where edit thread title for change to Solved
 

8 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

log users real time

hi.... how i can configurator a log file on real time....on unix solaris.... thanks a lot.... Best Regards... (3 Replies)
Discussion started by: chanfle
3 Replies

2. Shell Programming and Scripting

Real time log file redirect

Hi all, i would like to write the shell script program, it can monitor the access_log "real time" when the access_log writing the line contain "abcdef" the program will be "COPY" this line into a file named "abcdef.txt", do the same thing if the contain "123456" "COPY" it into a file named... (3 Replies)
Discussion started by: eric_wong_ch
3 Replies

3. Shell Programming and Scripting

Perl or Shell script to read a transaction log in real time

Hello, I have a Apache webserver running on RedHat. Its primary function is a proxy server for users accessing the internet. I have a transaction log that logs every transactions of every users. For users trying to access certain sites/content the transactions goes into a 302 redirect loop and... (2 Replies)
Discussion started by: bruno406
2 Replies

4. Shell Programming and Scripting

shell script to replicate the log files from one location to another in real time

Hi, On the server, we have app log files in this location /app/logs/error.log On the same server, in a real time, we would like to replicate that into /var/ directory. if someone has already done this, please share the script. Thanks in advance. (4 Replies)
Discussion started by: lookinginfo
4 Replies

5. HP-UX

HP-UX real time audit log writing

Hey all, I have a problem I was hoping to get some help on. So I have my two auditfiles, audfile1 and audfile2 that can be written to, I want to have the text version of them write to an NFS mount that I have set up. So i already know that i can do .secure/etc/audsp audfile1 > //nfsmount/folder/... (5 Replies)
Discussion started by: CleverRiver6
5 Replies

6. Shell Programming and Scripting

Archiving or removing few data from log file in real time

Hi, I have a log file that gets updated every second. Currently the size has grown to 20+ GB. I need to have a command/script, that will try to get the actual size of the file and will remove 50% of the data that are in the log file. I don't mind removing the data as the size has grown to huge... (8 Replies)
Discussion started by: Souvik Patra
8 Replies

7. UNIX for Advanced & Expert Users

How to read a fast written log file at Real time speed?

Hello All, I am building a real time parser for a log file in my application. The log file is continuously written at a very fast pace and gets rolled over every 10 minutes. I have measured the speed and observed that around 1000 lines are written to it every second, each line about 30-40... (7 Replies)
Discussion started by: cool.aquarian
7 Replies

8. Shell Programming and Scripting

Log all the commands input by user at real time in /var/log/messages

Below is my script to log all the command input by any user to /var/log/messages. But I cant achieve the desired output that i want. PLease see below. function log2syslog { declare COMMAND COMMAND=$(fc -ln -0) logger -p local1.notice -t bash -i -- "$USER:$COMMAND" } trap... (12 Replies)
Discussion started by: invinzin21
12 Replies

LEARN ABOUT DEBIAN

dh_pysupport

DH_PYSUPPORT(1) 						  python-support						   DH_PYSUPPORT(1)

NAME

       dh_pysupport - use the python-support framework to handle Python modules

SYNOPSIS

       dh_pysupport [debhelper options] [-V X.Y] [-X item [...]] [-n] [module dirs ...]

DESCRIPTION

       dh_pysupport is a debhelper program that will scan your package, detect public modules in /usr/lib/pythonX.Y/site-packages, and move them
       to the shared Python modules location. It will generate appropriate postinst/prerm scripts to byte-compile modules installed there for all
       available python versions.

       It will also look for private Python modules and will byte-compile them with the current Python version. You may have to list the
       directories containing private Python modules.

       If a file named debian/pyversions exists, it is used to determine the python versions with which the package can work.

       Appropriate dependencies on python-support, python and pythonX.Y are put in ${python:Depends}.  The ${python:Versions} and
       ${python:Provides} optional substitution variables are made available as well.

OPTIONS

       module dirs
	   If your package installs private python modules in non-standard directories, you can make dh_pysupport check those directories by
	   passing their names on the command line. By default, it will check /usr/lib/$PACKAGE, /usr/share/$PACKAGE, /usr/lib/games/$PACKAGE and
	   /usr/share/games/$PACKAGE

       -n, --noscripts
	   Do not modify postinst/postrm scripts.

       -d  This option is deprecated.

       -V X.Y
	   Force private modules to be bytecompiled with the specific X.Y python version, regardless of the default python version on the system.

       -X item, --exclude=item
	   Exclude files that contain "item" anywhere in their filename from being taken into account to generate the python dependency. It also
	   excludes them from byte-compilation. You may use this option multiple times to build up a list of things to exclude.

CONFORMS TO

       Python policy as of 2006-08-10

SEE ALSO

       debhelper(7)

       This program is a part of python-support but is made to work with debhelper.

AUTHORS

       Josselin Mouette <joss@debian.org>, Raphael Hertzog <hertzog@debian.org>

1.0.15								    2012-06-30							   DH_PYSUPPORT(1)
All times are GMT -4. The time now is 03:33 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy