03-11-2009
The events in the circular file have a time stamp. A typical circular file with a wrap over looks like this:
03/11/09 15:00:00 blablabla <=== beginning of circular file
03/11/09 15:01:00 yadayada
03/11/09 15:03:00 whatever! <=== latest update to circular file
03/11/09 14:55:00 hahahaha <=== will be overwritten next
03/11/09 14:57:00 i c ded p'pl
03/11/09 14:59:00 l8terz <=== end of circular file (wrap over)
In this particular example, the circular file can only hold 6 lines. The file wraps over when it reaches the end.
I want to be able to look at the updates in a realtime/sequential order. So if I were to do that now, I get the following echo to the screen:
$my_function
03/11/09 15:04:00 shlkfhdsfds
03/11/09 15:05:00 hahahakdfjdjfd
03/11/09 15:07:00 usuejfpsdff
03/11/09 15:08:00 pdspdsfpdf
(this would keep reporting until I stop it)
Even thought the circular file would look like this:
03/11/09 15:08:00 pdspdsfpdf
03/11/09 15:01:00 yadayada
03/11/09 15:03:00 whatever!
03/11/09 15:04:00 shlkfhdsfds
03/11/09 15:05:00 hahahakdfjdjfd
03/11/09 15:07:00 usuejfpsdff
Hope this helps!
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TAILF(1) Linux Programmer's Manual TAILF(1)
NAME
tailf - follow the growth of a log file
SYNOPSIS
tailf [OPTION] file
DESCRIPTION
tailf will print out the last 10 lines of a file and then wait for the file to grow. It is similar to tail -f but does not access the file
when it is not growing. This has the side effect of not updating the access time for the file, so a filesystem flush does not occur peri-
odically when no log activity is happening.
tailf is extremely useful for monitoring log files on a laptop when logging is infrequent and the user desires that the hard disk spin down
to conserve battery life.
Mandatory arguments to long options are mandatory for short options too.
-n, --lines=N, -N
output the last N lines, instead of the last 10.
AUTHOR
This program was originally written by Rik Faith (faith@acm.org) and may be freely distributed under the terms of the X11/MIT License.
There is ABSOLUTELY NO WARRANTY for this program.
The latest inotify based implementation was written by Karel Zak (kzak@redhat.com).
SEE ALSO
tail(1), less(1)
AVAILABILITY
The tailf command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
13 February 2003 TAILF(1)