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Full Discussion: Perl script logging via Shell script
Homework and Emergencies Emergency UNIX and Linux Support Perl script logging via Shell script Post 302474477 by DGPickett on Wednesday 24th of November 2010 10:48:54 AM
Old 11-24-2010
You can fuser the app's log before attaching to it, to see if you are already running, without additional files and fuss. I am not much of a perl jocey, but maybe you can do the sam check inside PERL; in ksh, it might look like this:
Code:
 
ps -fp $(fuser $logfile 2>/dev/null) | grep -c my_app | read ct

---------- Post updated at 10:48 AM ---------- Previous update was at 10:31 AM ----------

The pid file is popular, but you still need to ps -fp | grep or the like to ensure the pid in use is your app.

A tcp socket listener makes a nice mutex. You could assign a thread to providing a simple html status report within the app.


Using 'fuser' or the PERL equivalent on the app log file has several advantages and challenges:
  1. You find any children still running. You might want to purge them and restart if the main app is not running.
  2. No extra pid file.
  3. subshells make the count go up.
  4. users browsing the log may look like the app or like children, especially as the log path often contains the app name. (Maybe capitalize part of the app name in the log name?)
 

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LEARN ABOUT DEBIAN

lldptool-app

lldptool(8)							       Linux							       lldptool(8)

NAME

       APP - Show / manipulate APP TLV configuration

SYNOPSIS

       lldptool -t -i ethx -V APP [-c app]

       lldptool -T -i ethx -V APP [-d] app=prio,sel,pid

DESCRIPTION

       The  APP  TLV  is an informational TLV and will advertise the current configured application table. If the peer APP TLV and a local APP TLV
       match the same selector and protocol field the local parameter is used.

ARGUMENTS

       app    Configures a local application data field using the three parameters priority (prio), selector (sel), and  protocol  (pid).  The	-d
	      option can be provided to remove an entry which matches the three parameters.

Theory of Operations
       The  APP  TLV  is an informational TLV for most end stations it is not expected that setting APP data should be required. Peer data will be
       processed and added to the application data table by default assuming there does not already exist a local entry with matching selector and
       priority fields.

       By adding APP data to the application table it is available for applications, eg iscsid, to query. Applications query for a specific proto-
       col and selector and may use this data to map traffic to the corresponding traffic class.

EXAMPLE &; USAGE
       Configure ISCSI application for priority 4 on eth2
	      lldptool -T -i eth2 -V APP app=4,2,3260

       Configure FCoE application for priority 3 on eth2
	      lldptool -T -i eth2 -V APP app=3,1,35078

       Remove FCoE application for priority 3 on eth2
	      lldptool -T -i eth2 -V APP -d app=3,1,35078

       Display locally configured application table on eth2
	      lldptool -t -i eth2 -V APP -c app

       Display last transmitted APP TLV on eth2
	      lldptool -t -i eth2 -V APP

SOURCE

       o      IEEE 802.1Qaz (http://www.ieee802.org/1/pages/dcbridges.html)

NOTES

       Currently changing the default priority is not supported by default it is set to zero.

SEE ALSO

       lldptool(8), lldpad(8)

AUTHOR

       John Fastabend

open-lldp							   February 2010						       lldptool(8)
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