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Some scripting help needed

  • 27-06-2008 08:25PM
    #1
    SouperComputer
    Registered Users, Registered Users 2 Posts: 6,946 ✭✭✭


    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?


Comments

  • #2
    Jamar
    Registered Users, Registered Users 2 Posts: 52 ✭✭Jamar


    Perhaps I'm missing something, but

    grep '10.10.10.10' logfile | tail -10


  • #3
    bushy...
    Closed Accounts Posts: 1,462 ✭✭✭bushy...


    Maybe you could do something with tac ?
    #!/bin/bash
tac   logfile | grep $1 | head -10


  • #4
    brianmc
    Registered Users, Registered Users 2 Posts: 868 ✭✭✭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?


  • #5
    Khannie
    Registered Users, Registered Users 2 Posts: 37,485 ✭✭✭✭Khannie


    brianmc wrote: »
    I like this one.

    +1. Clever.


  • #6
    Arion
    Closed Accounts Posts: 37 ✭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


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  • #7
    SouperComputer
    Registered Users, Registered Users 2 Posts: 6,946 ✭✭✭SouperComputer


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


  • #8
    Khannie
    Registered Users, Registered Users 2 Posts: 37,485 ✭✭✭✭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.


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