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
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 05:48 PM.. Reason: I don't see where edit thread title for change to Solved
 
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flush(1T)						       Tcl Built-In Commands							 flush(1T)

__________________________________________________________________________________________________________________________________________________

NAME
flush - Flush buffered output for a channel SYNOPSIS
flush channelId _________________________________________________________________ DESCRIPTION
Flushes any output that has been buffered for channelId. ChannelId must be an identifier for an open channel such as a Tcl standard channel (stdout or stderr), the return value from an invocation | of open or socket, or the result of a channel creation command provided by a Tcl extension. The channel must have been opened for writing. If the channel is in blocking mode the command does not return until all the buffered output has been flushed to the channel. If the chan- nel is in nonblocking mode, the command may return before all buffered output has been flushed; the remainder will be flushed in the back- ground as fast as the underlying file or device is able to absorb it. EXAMPLE
Prompt for the user to type some information in on the console: puts -nonewline "Please type your name: " flush stdout gets stdin name puts "Hello there, $name!" SEE ALSO
file(1T), open(1T), socket(1T), Tcl_StandardChannels(3TCL) KEYWORDS
blocking, buffer, channel, flush, nonblocking, output ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+-----------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+-----------------+ |Availability | SUNWTcl | +--------------------+-----------------+ |Interface Stability | Uncommitted | +--------------------+-----------------+ NOTES
Source for Tcl is available on http://opensolaris.org. Tcl 7.5 flush(1T)

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