From: Srijayanth Sridhar <srijayanth@...>
Date: 2009-04-02T14:12:11+09:00
Subject: Re: Read and modify logs

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Sorry, I misread your question.

One silly way to achieve what you want is to reopen the file for reading.
That would pretty much erase the file. Not sure if that's what you want...

f.close
f = File.open("mylogfile.log","w")
f.close


Though, I don't see why you can't maintain a hash of all the lines instead
of having to remove lines from the log file. Its never a good idea to muck
about with log files.

Jayanth


On Thu, Apr 2, 2009 at 10:29 AM, Srijayanth Sridhar <srijayanth@gmail.com>wrote:

> There's at least a couple of ways to remove duplicate lines.
>
> 1) results.uniq!
> 2) results.each { |l| b<<l } # b.keys gives you the set of unique lines
>
> Hope that helps,
>
> Jayanth
>
> On Tue, Mar 31, 2009 at 9:11 PM, Michael Furmaniuk <mfurmaniuk@yahoo.com
> >wrote:
>
> > I'm trying to read the entries in a logfile so I can enter its contents
> > in a database, the lines are results I want to record, but in order to
> > be sure that I don't have duplicates I'd like to be able to remove
> > entries that I have read.  Is there an easy way to do this in Ruby so I
> > can remove read lines from a file that is open once they've been
> > captured?
> >
> > I'm not as worried about the conn_to_db.print line, that is something I
> > have working ok, so if it looks funny please ignore it.
> >
> > What I have so far, and its untested as of yet as I am trying to get the
> > form right, until I am sure its working .
> >
> > Example:
> > while running
> >  sleep 10
> >  # read file into an array
> >  f = file.open("mylogfile.log")
> >  saved = File.open("archive.log", "a")
> >  results = f.readlines
> >  # Is there a way to remove everything that's been read here?
> >  f.close
> >  results.each_line do |sending|
> >    conn_to_db.print("data #{sending}")
> >    # Make sure we keep a backup
> >    saved.puts("#{sending}")    s.flush
> >  end
> >  # Close the archive file
> >  saved.close
> > end
> >
> > Thanks for any help!
> > --
> > Posted via http://www.ruby-forum.com/.
> >
> >
>

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