Prcoessing outoput from tail

ruby-talk
1

Cool, thanks I will check this out. In the mean time I think I figured out a work around, the only problem left is to figure out how to make this thread-able:

IO.popen('tail -F foo.txt') {|file|
   while line = file.gets
   puts line
   end
}

The "while line" was what helped and I even tried the file rolling and tail complained but picked up the new file, so ijust need to process that error. Do you see any advantage using this over the gem (this way I don't have to make everyone download the gem as well).

TIA!
Phy

···

----- Original Message ----
From: Gustav Paul <gustav@rails.co.za>
To: ruby-talk ML <ruby-talk@ruby-lang.org>
Sent: Saturday, March 24, 2007 3:41:12 PM
Subject: Re: Prcoessing outoput from tail

Phy Prabab wrote:

Hello,

I am trying to figure out how to perpetually process the output from a file. That is I continuously want to process output that is appended to a file and that file could get rolled out at any time. I use popen w/tail, but this opens the file each time and I have to reprocess all the files content. Is there a better way to do this or a library that would help me? I know that I could probably open the file, tack location, and watch the inode to make sure the file has not been rolled, but that amounted to a lot of mistakes and I could never get it work properly.

Thanks for the help!
Phy

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Check out the file-tail gem:

http://file-tail.rubyforge.org/

Cheery-o,
Gustav Paul

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2

Phy Prabab wrote:

Cool, thanks I will check this out. In the mean time I think I figured out a work around, the only problem left is to figure out how to make this thread-able:

IO.popen('tail -F foo.txt') {|file|
   while line = file.gets
   puts line
   end
}

The "while line" was what helped and I even tried the file rolling and tail complained but picked up the new file, so ijust need to process that error. Do you see any advantage using this over the gem (this way I don't have to make everyone download the gem as well).

TIA!
Phy
  

Great! Looks like that works fine. I haven't used the file-tail gem,
just remember having seen it somewhere a while ago, so I can't give you
much feedback on it. You mention making the code 'thread-able'...what do
you mean exactly?

Gustav