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Full Discussion: Alternative to tail -n -0 -F for monitoring live log file
Top Forums UNIX for Advanced & Expert Users Alternative to tail -n -0 -F for monitoring live log file Post 302952351 by ketanraut on Tuesday 18th of August 2015 07:02:26 AM
Old 08-18-2015
well this is the script i have modified.
when i am running
Code:
tail -f opt/All/Meta/CableData/logs/meta_all/Server.log" |tail +10| egrep -i "Rebuilding free list took"

on command line and appending lines in Server.log its gives the perfect out put.
but by using below script tail -f wont redirect its out put to while loop.

Code:
#!/bin/bash
o=$IFS
IFS=$(echo -en "\n\b")
LOG_DIR="/opt/All/Meta/CableData/logs/meta_all"
while read myline; do
BIND_VAL=$(echo $myline | awk -F' ' '/Rebuilding/ {print $7}')
if [ "$(echo $myline| awk -F' ' '/Rebuilding/ {print $7}' | bc -l)" -gt 5 ];then
echo $myline | mailx -s "Alert from server for Rebuilding free list " 'KetanR@abc.com'
fi
done <$(tail -f $LOG_DIR"/Server.log" |tail +10| egrep -i "Rebuilding free list took" )
IFS=$o

Executing script in debug mode:
Code:
while read myline; do

BIND_VAL=$(echo $myline | awk -F' ' '/Rebuilding/ {print $7}')
if [ "$(echo $myline| awk -F' ' '/Rebuilding/ {print $7}' | bc -l)" -gt 5 ];then
echo $myline | mailx -s "Alert from server: $SERVER_IP for Rebuilding free list " 'Ketan.Raut@sigma-systems.com'
fi
done <$(tail -f $LOG_DIR"/DHCPServer.log" |tail +10| egrep -i "Rebuilding free list took" )
tail -f $LOG_DIR"/DHCPServer.log" |tail +10| egrep -i "Rebuilding free list took"
++ tail -f /opt/Alopa/MetaServ/CableProv/logs/metaprov_new/DHCPServer.log
++ tail +10
++ egrep -i 'Rebuilding free list took'

Any Suggestion?
Last edited by Corona688; 08-18-2015 at 12:17 PM.. Reason: Use [code], not [icode]
 

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LEARN ABOUT DEBIAN

mtail

MTAIL(1)							   User Commands							  MTAIL(1)

NAME

       mtail - tail variant designed for web developers monitoring logfiles

SYNOPSIS

       mtail [options]	<file>...

DESCRIPTION

       MonkeyTail  allows  a  user to tail multiple files on both local and remote hosts and clearly marks inactivity by putting 5 newlines in the
       output whenever a pause in output over 3 seconds is detected.

       MonkeyTail is implemented a fairly simple wrapper script around standard tail, ssh, and sudo.

OPTIONS

       -q     Quiet mode

       --quiet
	      "    "

       -n     Output the last N lines of each file before tailing (defaults to 0)

       <file>...
	      Files to tail.

	      These can specified in the following ways:

       @<groupname>
	      - expands the group (from .mtailrc) to a list of

	      files to tail

       <filename>
	      - tails a local file.

       +<filename>		- attempts to sudo and tail a local file (will
	      prompt for pwd if required).

       <remotehost>:<filename>
	      - attempts to invoke tail via ssh on a remote

	      host.

       +<remotehost>:<filename> - attempts to invoke sudo tail via ssh on a
	      remote host (will prompt for pwd if required).

SEE ALSO

       mtailrc(5), tail(1)

AUTHOR

       Martyn Smith <martyn@dollyfish.net.nz>

mtail								     May 2008								  MTAIL(1)
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