How do I get my script to monitor a new file using tail? Post: 302323281

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Top Forums Shell Programming and Scripting How do I get my script to monitor a new file using tail? Post 302323281 by Franklin52 on Saturday 6th of June 2009 08:58:44 AM

06-06-2009

Registered User

Quote:

Originally Posted by lstorm2003

I wrote a script to do this for me and its working great, my only problem is that once per week, this log file is archived to another directory, and a new log is created. I need to monitor the NEW log file, but even though the old one is moved, my tail which is always running (tail -f | while) still seems to be looking at the OLD file. How can I get my script to work and start reading the NEW log file each week? The only way I can think of to do this is to have another script which runs every week that kills my script and re-starts it...

Here is the specific line in my script where it stops and sits forever when the log file is archived (ASAI.log) and a new one is created:
tail -n1 -f /home/dirTalk/current_dir/oamlog/ASAI.log | while read output_line

If you delete the log file you also break the file handle linked with the tail command. Instead of delete the file empty it after archiving with:

Code:

cp /dev/null /home/dirTalk/current_dir/oamlog/ASAI.log

Regards

Last edited by Franklin52; 06-06-2009 at 11:05 AM..

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LEARN ABOUT SUNOS

script

script(1)							   User Commands							 script(1)

NAME

       script - make record of a terminal session

SYNOPSIS

       script [-a] [filename]

DESCRIPTION

       The  script  utility  makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the
       record is saved in the file typescript. See WARNINGS.

       The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends
       when the forked shell exits or when Control-d is typed.

OPTIONS

       The following option is supported:

       -a	Appends the session record to filename, rather than overwriting it.

NOTES

       script places everything that appears on the screen in filename, including prompts.

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

WARNINGS

       script  can  pose  a  security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a
       privileged user, that is, root. Be sure that typescript is not a link before running script.

SunOS 5.10							    30 Jan 2004 							 script(1)