From: Pedro Fortuny Ayuso <pfortuny@...>
Date: 2006-12-11T22:02:23+09:00
Subject: Re: Newbie questions

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I would do somethink like:

a = File.open("name_of_file")
whole_file = a.inject("") {|s,e| s+e}
a.close

That injects into "" each line of a, thus giving you a long string
whole_file.

However, if you are doing stuff *line by line* you had better do sth like

a = File.open("name_of_file")
a.each do |line|
  YOUR STUFF WITH line
end
a.close

For example, you want to count the number of lines where the word "foo"
appears

a = File.open("myfile")
count = 0
a.each do |line|
  count += 1 if line =~ /foo/
end
a.close

count has now that value.

Though I am not an expert, so listen to more people.

Pedro.



On 12/11/06, Dav Jones <kakaze@talk21.com> wrote:
>
> Hello, I'm quite new to this whole Ruby malarky and I'm having some real
> trouble with more intermediate features.
> You will probally laugh at how simple this stuff is but I really can't
> figure it out. The online manuals are all written with the expert in
> mind and trial and error doesn't really work as it does with less
> complex stuff.
>
> What I'm wanting to do is read a text file and then do some stuff to it.
> So...:
>
> 1: How do I use the 'source' command to read the file into somewhere
> usable?
> I'm wanting to do stuff to each line of the file individually once I
> have it.
>
> 2: How do I apply a regular expression to the lines of the file?
>
>
> The most I can get right now is reading the file in and printing it out.
> Its just errors galore trying to figure out anything more....
>
> --
> Posted via http://www.ruby-forum.com/.
>
>


-- 
Pedro Fortuny Ayuso
C/Capuchinos 14, 1. 47006 Valladolid. SPAIN
http://pfortuny.sdf-eu.org

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