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Hi,
try MobaXvt
MobaXterm - The free multitab Unix browser for Windows (http://mobaxvt.mobatek.net/en/)
its a pre compiled cygwin binary which works well on XP and ok under Vista. I have found...

You need to grab the PID of the tail proc and kill it

if string_found
get PID && kill $PID

and then loop round

Sorry no code but hope that points you in a direction that helps.

You need to quote out stuff, also run the script as a bourne shell script

#! /bin/sh
aa=`ps -o user | grep -v USER | uniq`
if [ ${aa} = "cool" ] ; then
echo "${aa} is cool"
...

Try looking...

#!/bin/ksh
hour=$(date | cut -c12-13)
echo $hour


Odd it works fine on my Slackware box under sh and ksh and on OSX under
sh/bash and zsh.

Try
hour=`date | cut -c12-13`
echo ${hour}

Google for RUTE its is very very good, it's free and in HTML or PDF format.

Have fun.