You need to start learning shell programming from scratch. Perhaps the bash guide in my signature will help (the bash scripting link is broken).
You need to:
1. run a loop reading one kine after the other from the file e.g.
Code:
total=0
while read IPADDRESS
do
.... here you process IPADDRESS
done < ipaddress-file
2. In the loop, run
whatmask on the IP address and process its ouput
Code:
whatmask $IPADDRESS | grep ^Usable | awk -F: ‘{ print $2 }’
This code gets the line that starts with
Usable.
awk then prints the second field of that line, where fields are delimited by a colon.
3. Get the number of usable IP addresses from step 2 and add it up. This is complicated by the fact that whatmask uses commas to structure large numbers like 8,192.
Code:
nip=$(whatmask $IPADDRESS | grep ^Usable | awk -F: ‘{ print $2 }’ | sed ‘s/,//‘)
total=$((total+nip))
This gets the output of the pipeline inside $(...) and assigns it to
nip.
The
sed command removes commas. It could also be done inside the
awk command, but I don’t know the required manipulations by heart.
The second line sums it up. Dollar signs are not needed inside the double parentheses.
This is not tested.
Trying to be figure out the total Usable IP Addresses using whatmask and adding multiple IP addresses in a text file with a script
