Extracting certain data within a script output file

For filtering data from file is better to use grep. For example:

grep <search string> <filename>

With awk you can use something like:

awk '/string/ {command}' <filename>

To get IPs counted you can use

uniq -c <filename>

This will provide you uniq IPs with count

I take it that "rolls up" means that all newlines are removed and the output of each command is thus "rolled up" to a single line. If so, your grep ... | awk ... will work, but you don't need both commands ("never use two when one will suffice" is generally a good idea). In addition, your command line has a couple issues (like no input for grep but a filename given to awk, means the grep is non-functional, and no reason for using wc when grep has a -c option).

ipaddr=192.168.0.1
grep -c "netstat -anp.*$ipaddr" logfile

Edit: Your latest comment says you want to count how many times the IP address appears within a given interval. Since the netstat command is run multiple times within the interval and since they're all on one line, a simple uniq -c won't suffice. In fact, without resorting to perl, this is the first thing I came up with:

ipaddr=192.168.0.1
grep "netstat -anp.*$ipaddr" logfile |
    tr -cs '0-9.' '\012' |
    grep -c "$ipaddr"

I'm assuming a POSIX or BSD-style tr command. In addition, the second grep is necessary because there could be many other IP addresses other than the one you're looking for (that would be typical for netstat output).