Re: [PLUG] correct way to do this in bash

[bergman@merctech.com]

In the message dated: Tue, 22 Sep 2009 22:21:30 EDT,
The pithy ruminations from Walt Mankowski on 
<Re: [PLUG] correct way to do this in bash> were:
=> 

	[SNIP!]

=> 
=> Another solution no one's suggested yet is to change the log files

Yet another option, since we're getting further from the initial question, is to
replace the logfile with a FIFO*. This leaves the data generating program
unchanged, and alows you to use any program you want to receive the log data and
slice & dice & rotate it as needed.

For example:

	mknod /var/log/fifo
	huge_simulation_program > /var/log/fifo
	processlogs < /var/log/fifo &


[OB-BASH]	
Where the script "processlogs" is something like this completely untested, 
off-the-top-of-my-head code:

####################################
#! /bin/bash
count=0
while [ 0 ]
do
	while [read input]
	do
		now=` date "+%H%M%S"`
		if [ $now = 080000 ] ; then
			# it's 8AM...of course, this test is bound to fail
			# if the loop takes more than 1second
			count=$((count + 1))	
			compressneeded=YES
		fi
		echo $input >> /var/log/logfile.$count
		if [ $compressneeded = YES ] ; then
			bzip2 /var/log/logfile.$((count - 1)) &
			compressneeded = NO
		fi
	done
done			
########################################
[/OB-BASH]



*
	http://www.linuxjournal.com/article/2156
	http://en.wikipedia.org/wiki/Named_pipe


Mark

=> Walt
=> 

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