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Alternations should be parenthesised

egrep -v '(T11|12.4\((7|3)\))'

Just remove the code from the fist part:{for(i in b){if(b[i]-1&&a[i]!=b[i]){}else{print "NEW:"i";\t\t"b[i]} } }

OK think I have it now:

cd /path/to/cisco/logs
files=`ls ciscostats_* | sort -t_ -k2.5r -k2.3,2.4r -k2.1,2.2r`
awk -F, -vLOOK=50 -vMATCH=20 '
FNR==1{F++}F==1{a[$1","$2","$3]++;next}
...

OK give this a try, you can change the value LOOK to control how many files are searched and MATCH for how many must match.

cd /path/to/cisco/logs
files=`ls ciscostats_* | sort -t_ -k2.5...

This might be close to what you need.

It compares the newest file against the 50 most recent and any record that appears in more than 20 files is printed:

cd /path/to/cisco/logs
files=`ls...

In a earlier post you said that things were printing all over the place. The printf was just so you could see what file each line was comming from.

printf outputs the pathname of the file with...

Can't explain why tail if failing to open the file.

You could try:
tail -2 < /var/tmp/$ip/test.log | head -1
or
cat /var/tmp/$ip/test.log | tail -2 | head -1

oops sorry typo in the script try this:

while read ip
do
printf "/var/tmp/%s/test.log: " $ip
tail -2 /var/tmp/$ip/test.log | head -1
done < /tmp/ip_list

how about:

while read ip
do
printf "/var/tmp/%s: " $ip
tail -2 /var/tmp/ip_list | head -1
done < /tmp/ip_list

If it's the 1.1.1.1 that's being replaced, don't put 1.1.1.1 in there.

Also, don't put spaces, that will seperate it into different filenames as far as the shell's concerned.
while read ip
do
...