From: Daniel Sheppard <daniels@...>
Date: 2005-10-28T14:48:44+09:00
Subject: Re: Newbie help: File searching and writing output to new file


> "file" is a string, the name of a file. It isn't a file handle.
> You are not reading from a file.

eep. What he said. It seems I'll never learn to test my code before
posting...

def find_redir
  File.open("found-redir-lines.txt", "w") do |out|
    Dir['ex*.log'].each do |in|
      File.open(in) { |f| f.grep(/redir/) { |line| out.puts(line) } }
    end
  end
end

> ruby -ne"print if /redir/" ex*.log >out.txt

Yeah, but that's cheating - you changed the behaviour. What if that
found-redir-lines.txt file was important for something else?

ruby -ne "i=0;open('found-redir-lines.txt','w'){|f|if
/redir/;a=$_;f.puts a;i+=1;puts a if i<2;end}" ex*.log
ruby -ne "i=0;open('found-redir-lines.txt','w'){|f|if
/redir/;a=$_;f<<a;i+=1;puts a if i<2;end}" ex*.log
ruby -ne "i=0;open('found-redir-lines.txt','w'){|f|if
/redir/;f<<$_;print if(i+=1)<2;end}" ex*.log
ruby -ne "i=0;open('found-redir-lines.txt','w'){|f|f<<$_&&(print
if(i+=1)<2)if/redir/}" ex*.log

And I think that's about as much golf as I'm capable of playing.


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