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It works!!! Thank you very much. It'was some stupid error of mine. I don't understand why but it works. If you have a little time could you please explain the syntax

$ awk ' { arr[$2]=$0 } END { ...

Ok. Input file

date mac ip
01:01:01:10.01 aa:bb:cc:dd:ee:ff 1.2.3.4
01:01:01:10.02 aa:bb:cc:dd:ee:ff 1.2.3.3
01:01:01:10.03 aa:bb:cc:dd:ee:ff 1.2.3.5
01:01:01:10.04 aa:bb:cc:dd:ee:ff 1.2.3.8...

Thank you very much but I don't understand. I know is a fault of mine, I am a very beginning awk scripter. Can you give me a complete code, it' seems to me that is the key statement that is the "key"...

I don't understand very well where you say "add conditions according to your needs". The matter is a little more complicated, I've got about 2.000 entries, sometimes I've got something like this
...

Hi,

I'm working on a little script, for first I transformed epoch (unix date in seconds) in a human readable date in this way

cat arp.dat | sort -k 3 | gawk '{ print strftime("%d:%m:%Y:%H:%M",...

Tomorrow I will try your last suggestion. A unique file is good, but I have to prepend to every line of output the ip of the swith, if not I know where is the port and the associated mac but I don't...

About troubleshoothing you are right, you have helped so much so it's better that I do something as well, but I have no files, one per host in /tmp. I suspect that the error is due to this line of...

It's a good one, but I do not want to add to much complexity for the moment (now the script is very simple and I alredy need a lot of help ...). By the way, the host trick gives me some troubles....

No, I am sure it works but sure, I've done some changes in the original because that one doesn't work. There was an error in snmpwalk syntax (for my switch of course, for others maybe it works well),...

I've done a man egrep and indeed egrep -f canno't work in our case.

Everyway the awk solution works well. I've got the host issue to solve and my little script is ready. Of course I can make one...

I'm testing the egrep solution but I have no match. Maybe I do some errors.

This is the egrep command

egrep -f upd_file master_file > matched_file

I suppose upd_file is the one with ip port...

Thank you, very fast and useful replay, it works.

Another question, my first script (or better Ivanov script see...

Hi,

I'm working with snmp, with a little script I'm able to obtain from a switch a list with a couple of values with this format

Port Mac
1 00:0A:0B:0C:0D:0E
....
(hundred of entries)

...