Hi Jimp, I didn't post previous screen for security reasons, entries were present ;)
In any case, I tried your command for multiple grep matches and it works!
Thank you a lot!
Have a nice day.
Giuseppe

To be more efficient, if you want to match lines with both strings, you should make one pattern that has both in the correct order:

: tail -f /var/log/filter.log | filterparser.php | grep 'block.*x\.x\.x\.x'

If you want to match multiple patterns (e.g. all blocks or all matches of that IP address) then you would use egrep or grep -e along with a pattern like '(block|x\.x\.x\.x|y\.y\.y\.y)' and it will match any of those patterns rather than requiring them all.

Just a little more question if possibile:

To see logs in command line (realtime) I use:
tail -f /var/log/filter.log | filterparser.php | grep -w [ip address]

I noticed however that this command allows only 1 grep.

Is there a way to increase to at least 2 grep?
For example it should be useful to add:

tail -f /var/log/filter.log | filterparser.php | grep -w [ip address] | grep block

but as you may see there are no results.

Thanks,
Giuseppe

If that doesn't find anything then there may not be any matching logs for that one address at the time you searched.