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Full Discussion: Break out of tail -f
Top Forums Shell Programming and Scripting Break out of tail -f Post 302779245 by sai2013 on Tuesday 12th of March 2013 11:58:29 AM
Old 03-12-2013
I do have a single script for both Server Startup & Shutdown with parameters defining the operation & Search Keyword. In both cases, we are monitioring the same file.

There are two scripts - Startup & Shutdown. I added a line at the end of each to execute my script which reads the Server log file.

Once the server starts, we send a message to Syslog and stop reading the log file.

At a later point, when someone decides to stop the server using the shutdown script, it will again invoke my script (which looks for the SHUTDOWN keyword in the log file and send the message to syslog).





Quote:
Originally Posted by RudiC
Wouldn't it make much more sense, esp. as both scripts are managed by you, to write one single script that intercepts both keywords and triggers the respective reaction?
---------- Post updated at 11:58 AM ---------- Previous update was at 11:44 AM ----------

I dont have to be concerned about change in file name. Since, my source file name will not change though we have log files rotating.

Quote:
Originally Posted by DGPickett
If the file size is the same, sleep some more.
File size will continually change. during startup, during the time server is up and when the server is shutdown.

Quote:
Originally Posted by DGPickett
A C/C++/JAVA/PERL/Python level app can keep track of where it has looked and just look at new areas much more easily. Shell has to live with tail -f or some sort of polling the whole file. You might be able to seek in shell using 'tail -####c', where you check between the last and current file size (from ls -l?), then reset the last file size to that current size. If the file size is the same, sleep some more.Rotating logs adds a whole new level of complexity. If you had checked file N up to byte M and it is rotated, you have to detect that and start with Byte M of file N at the new name, then move to the current file. You high water mark is a file number and a byte count.
 

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LEARN ABOUT DEBIAN

scanlogs

SCANLOGS(8)						      System Manager's Manual						       SCANLOGS(8)

NAME

       scanlogs - summarize INN log files.

SYNOPSIS

       scanlogs [ norotate ] [ nonn ]

DESCRIPTION

       Scanlogs  summarizes  the information recorded in the INN log files (see newslog(5)).  By default, it also rotates and cleans out the logs.
       It is normally invoked by the news.daily(8) script.

KEYWORDS

       The following keywords are accepted:

       norotate
	      Using this keyword disables the rotating and cleaning aspect of the log processing: the logs files are only scanned for  information
	      and no contents are altered.

       nonn   Normally the nn log file is scanned and rotated.	Using this keyword disables this function.

       If scanlogs is invoked more than once a day, the ``norotate'' keyword should be used to prevent premature log cleaning.

HISTORY

       Written by Landon Curt Noll <chongo@toad.com> and Rich $alz <rsalz@uunet.uu.net> for InterNetNews.  This is revision 1.1, dated 1996/10/29.

SEE ALSO

       innd(8) newslog(5), news.daily(8), nnrpd(8).

																       SCANLOGS(8)
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