#!/bin/bash
# logwatch
# Watch a log file for changes, printing each line as it appears.  Kinda like 'watch' except it perserves
# the scrollback buffer and you don't have to get the output to exactly fit in the screen.
# usage: logwatch <logfile>

# How often should the script poll the logfile (in seconds)
delay=10

logfile=$1
lastline=`tail -n 1 $logfile | sed 's/[ ]*$//'`
cat $logfile

until [[ $logfile == 1 ]]
do
logtemp=`tail -n 20 $logfile | sed 's/.*/&#/'`
currentline=`echo $logtemp | sed 's/#\ /\n/g' | tail -n 1 | sed 's/[ ]*$//' | sed 's/#$//'`
linenumber=0
	until [[ "$lastline" == "$currentline" ]]
	do
	currentline=`echo $logtemp | sed 's/#\ /\n/g' | tail -n 1 | sed 's/[ ]*$//' | sed 's/#$//'`
		if [[ "$lastline" == "$currentline" ]]
			then :
			else linenumber=$(( linenumber + 1 ))
			logtemp=`echo $logtemp | sed 's/#\ /\n/g' | sed '$d' | sed 's/.*/&#/g'`
		fi
	done
tail -n $linenumber $logfile
lastline=`tail -n 1 $logfile`
sleep $delay
done