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Full Discussion: Knowing when a different program modifies a file
Top Forums UNIX for Dummies Questions & Answers Knowing when a different program modifies a file Post 302795427 by hanson44 on Wednesday 17th of April 2013 05:00:07 PM
Old 04-17-2013
Try the following, and you will see that while you are editing the file, syslog continues to update the log file.

- go to the end of the file in vi and see what is there.
- wait a few minutes to let something loggable happen.
- in a separate window, do a tail on the log file.
- the results will be different, because syslog continues to update the file.

Here is another demo:
Code:
$ date > date.txt
$ vi date.txt # will see single line
$ date >> date.txt # in another window, while vi open
$ cat date.txt
Wed Apr 17 13:56:14 PDT 2013
Wed Apr 17 13:56:27 PDT 2013

When you saved the log file from within vi, you wiped out the changes that syslog had made. Normally, not a good idea to make changes to syslog log file, unless some over-riding benefit.
 

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LEARN ABOUT OPENSOLARIS

ds.log

ds.log(4)							   File Formats 							 ds.log(4)

NAME

       ds.log - Availability Suite data services log file

DESCRIPTION

       The  /var/adm/ds.log file contains the Availability Suite data services command log. The administration commands log activities to the file
       in the format:

	 date time product: message

       Note that when the size of the log file exceeds 10 Mbytes, ds.log is renamed  /var/adm/ds.log.bak  and a new /var/adm/ds.log file  is  cre-
       ated.

       The ds.log fields are:

       date

	   The	date format is mmm nn, where mmm  is  the local three-character abbreviation for the month and nn is the day of the month on which
	   the event occurred.

       time

	   The time of the event, in hh:mm:ss format.

       product

	   A product code that identifies which component of the data services produced the event. The code is separated  from	the  message  that
	   follows by a colon (:) and a space.

       message

	   A  message  that  can extend over  more  than  one  line describing the event that occurred. The second or following lines are not pre-
	   fixed by  the  date, time, and product code strings.

EXAMPLES

       The example below shows sample ds.log file content:

	 Jan 25 05:26:17 ii: iiboot suspend cluster tag <none>
	 Jan 25 05:32:02 ii: iiboot resume cluster tag <none>
	 Jan 25 05:32:04 sv: svboot: resume /dev/vx/rdsk/bigmaster
	 Jan 25 05:32:04 sv: svboot: resume /dev/vx/rdsk/bigshadow
	 Jan 25 05:32:04 sv: svboot: resume /dev/vx/rdsk/mstvxfs
	 Jan 25 05:32:04 sv: svboot: resume /dev/vx/rdsk/master01

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +---------------------+---------------------------------------------------------+
       |   ATTRIBUTE TYPE    |			   ATTRIBUTE VALUE		       |
       +---------------------+---------------------------------------------------------+
       |Architecture	     | x86						       |
       +---------------------+---------------------------------------------------------+
       |Availability	     | SUNWscmu 					       |
       +---------------------+---------------------------------------------------------+
       |Interface Stability  | Committed					       |
       +---------------------+---------------------------------------------------------+

SEE ALSO

       iiadm(1M), sndradm(1M), svadm(1M), attributes(5)

SunOS 5.11							    08 Jun 2007 							 ds.log(4)
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