From: Robert Klemme <shortcutter@...>
Date: 2011-02-02T21:01:25+09:00
Subject: Re: Search String and Delete Line Containing String

On Tue, Feb 1, 2011 at 9:28 PM, Bob Hatch <roberth@monavie.com> wrote:
> I am new to Ruby and am pulling my hair out on something that I know is
> simple. I am searching a large text file, line by line for text that
> will reside in part of the line. If it finds part of the text, I want to
> delete the line. Here is what I have that is not working. Help is
> appreciated! Thanks in advance!
>
> # process every line in a text file
> file='c:\ruby192\my_projects\IIS_Logs\ex11012607.log'
> text=File.readlines(file).each do |line|
> search_text = "/memberinfo/downline/tree/canvas.asp"
> if(line.gsub!(search_text) == search_text) then
> #line.clear
>  puts search_text
> else
>  puts "Not Found"
> end
> #puts line
> end

The simplest solution for this that I can think of is

fgrep -v "/memberinfo/downline/tree/canvas.asp"
'c:\ruby192\my_projects\IIS_Logs\ex11012607.log'

with proper shell tools installed.  With Ruby you can do

ruby -ne 'puts $_ unless %r{/memberinfo/downline/tree/canvas.asp}i =~
$_' 'c:\ruby192\my_projects\IIS_Logs\ex11012607.log'

You can even do an inplace replacement of the file by inserting -i.bak
in the command line.

Kind regards

robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/