Some scripting help needed

SouperComputer

Hi guys, scripting isnt my strongpoint but im pretty sure it would be a cakewalk for a regular.

I need a script to grep an IP address from the end of a log file, backwards until it finds 10 matches or hits the start of the logfile. The IP address that I am look for will change with each search of course. Output to screen is fine.

Any ideas?

Jamar

Perhaps I'm missing something, but

grep '10.10.10.10' logfile | tail -10

bushy...

Maybe you could do something with tac ?

#!/bin/bash
tac   logfile | grep $1 | head -10

brianmc

Jamar wrote: »

Perhaps I'm missing something, but

grep '10.10.10.10' logfile | tail -10

I like this one.

I'd change it to backslash the dots in the IP address though.

Perhaps there's an option to grep to ignore regular expression characters?

Khannie

brianmc wrote: »

I like this one.

+1. Clever.

Arion

brianmc wrote: »

I like this one.

I'd change it to backslash the dots in the IP address though.

Perhaps there's an option to grep to ignore regular expression characters?

fgrep or grep -F

SouperComputer

Thanks for all the input guys. I went with tac in the end. So simple, cant believe Ive never come across it!

Khannie

Just "man tac"'d. Never come across it before either. Useful to know.

To save anyone else the hassle.....

NAME
       tac - concatenate and print files in reverse

SYNOPSIS
       tac [OPTION]... [FILE]...

DESCRIPTION
       Write  each FILE to standard output, last line first.  With no FILE, or
       when FILE is -, read standard input.