Shell Programming and Scripting

Basically my requirement is to know the total number of free anonymous ports.

anonymous port range is 32768- 65535.

i wrote a script for that





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Code:

for i in {32768..65535}
do
netstat -an | grep $i > /dev/null 
        if [ $? -ne 0 ]
        then
portcount=$((portcount+1))
        fi
done
echo "Totat free anonymous ports are portcount"

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but the above script take 20 mins to execute

Also tried this way

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Code:

netstat -an > $HOME/netstat.out
for i in {32768..65535}
do
grep $i $HOME/netstat.out > /dev/null
        if [ $? -ne 0 ]
        then
portcount=$((portcount+1))
        fi
done
echo "Totat free anonymous ports are:$portcount"

*******************************************************

but still no luck.

Is there a quick way to acheive this ?