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You could use nc to test postgress is listening on it's port:


if nc -w 3 -z 10.66.1.133 5432 < /dev/null > /dev/null 2>&1
then
echo "Postgress is running"
else
echo "Postgress NOT...

Try the following and post the results:

ls -al /etc/mail

Try (while running as root):
chmod 755 /etc
and then see if the problem persists.

If the problem isn't resolved by that change; show us the output from the command:
ls -ld / /etc /etc/mail

Well, try this (untested!):
#!/bin/bash
UplistFilePath="/root/Uplist.txt"
DownlistFilePath="/root/Downlist.txt"
rm -rf $UplistFilePath
rm -rf $DownlistFilePath

while IFS="\t" read $ip...

Use cron to run that script every n minutes from 10:00h till 17:00h. If you replace the second while loop with a mail command there won't be any terminal output (which cron would send per mail...

With a TAB delimited file IPfile.txt like 10.66.1.133 TIRUNELVELI UNIT I 753
10.66.6.133 TIRUNELVELI UNIT II 74P
10.66.7.133 TIRUNELVELI CAB 74U
10.66.0.133 TENKASI 666...

What is the output from:
ls -l /etc/mail
(the option is the letter ell; not the digit one) on your system.

I like MadeInGermany's idea of doing a host name lookup as this will involve less maintenance of your script, but it would involve ensuring all these machines are entered in the hosts file.

But if...

How about this:

IPS="10.66.1.133 10.66.6.133 10.66.7.133 10.66.0.133
10.66.1.5 10.66.2.133 10.66.4.133 10.66.3.133
10.66.5.133 10.66.2.5 10.66.3.5 10.66.7.5
...

You could try something like this:

#!/bin/bash

upcnt=0
downcnt=0
for ip in 192.168.1.{3..19}
do
if ping -c 1 -W 1 $ip > /dev/null
then
let upcnt=upcnt+1
...