From: Robert Klemme <shortcutter@...>
Date: 2012-06-04T21:19:45+09:00
Subject: Re: Read from several .txt files by a pattern and write the matched lines to a new file

On Mon, Jun 4, 2012 at 2:13 PM, Robert Hansen <lists@ruby-forum.com> wrote:
> Just to be said. I am new to ruby.
>
> This should iterate over an array of files, read them and match the
> lines by a given pattern. And print to console, But how to proceed if i
> want all of the matched lines to be written to a new file?

You could invoke the script with an output redirection.  That's just
one option, of course.

> $files = Array.new
>
> Dir.glob("**/Msg.log").entries.each { |n| $files.push(n) if
> File.file?(n) }
> puts "\n#{$files.size} files found\n"
>
> pattern = /(failed)/m
>
> $files.each do |element|
>         f = File.open(element, 'r')
>              lines = f.readlines
>              lines.each do |line|
>                  if line.match(pattern)
>                      puts line
>                        end
>                     end
>                     f.close
>                end
>
>
>
> I have tried different solutions as
> File.open('newfile.txt', 'w') do |wirte|
> write.puts(line)
>
> but it did not work

What was the issue?  Can you share an error message?

> Any suggestions? Thanks

Watch your spelling.

Other than that: your task can be solved with other tools pretty easily

$ find . -type f -name Msg.log -exec fgrep failed {} + >newfile.txt

Kind regards

robert

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