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The syntax to use a function pointer is a little tricky, but the concept isn't hard at all if you know what a pointer is. It's just a pointer, that points to a function, because functions reside in...

while [ $count -le 10 ]
you need [ $count -gt 0 ]
count='expr$count-1'
You used normal quotes instead of backticks, you forgot spaces before the $ and around the minus sign

#! /bin/ksh
count=10
while [ $count -ge 1 ]
do
echo $count
count=$(expr $count - 1)
done

why do you want to use "echo" ? try remove this and try again

#!/bin/ksh
read IP_ADD
echo nslookup $IP_ADD 2>&1| tee log1.txt
cat /amex/gcst/siva/Testr/log1.txt
awk '/^Name:/{print $2} '...

find . -type f ! -name "*.so" -exec grep -l "[0-9][0-9]*.[0-9][0-9]*.[0-9][0-9]*.[0-9][0-9]*" {} \;

This could help..may be

grep sqsh | awk -F- '{print $2,$3}' inputfile