[ruby-talk:10345] Re: Efficiency Check

>From: "酵費七(Park, Hee-Sob)" <[e-mail]>
>Reply-To: [e-mail]
>To: [e-mail] (ruby-talk ML)
>Subject: [ruby-talk:10339] Re: Efficiency Check
>Date: Sun, 4 Feb 2001 16:10:07 +0900
>
>Hi,
>
>"Jason" <[e-mail]> wrote in message
>news:95iage$8n$[e-mail]...
> > Hi All,
> >
> > Below is a directory wide (or file wide, depending on your preference)
> > search and replace method, written in Ruby.  Just so I know I'm on the
> > right track, is that the quickest way to write the application (ie, is
> > there a shortcut around creating an object named aFile, and then
> > writing to the file?
> >
> >
> >  def sr(searchString, replaceString, fileName)
> >  if File.stat(fileName).file?
> >      aFile =  File.open(fileName, "r").read.gsub(searchString,
> > replaceString)
> >      File.open(fileName, "w").print(aFile)
> >  end
> > end
> > (ARGV.length - 2).times { |i| sr(ARGV[0], ARGV[1], ARGV[2+i])}
> >
>
>How about this?
>
>#!/usr/local/bin/ruby -pi
>BEGIN {
>   $searchString = ARGV.shift
>   $replaceString = ARGV.shift
>}
>gsub($searchString,$replaceString)
>
> > Jason
> >
>

I'm curious as to why the BEGIN block is used here?  Also, seeing as there's 
no error checking or anything, and you're assuming arguments, why not:
#!/usr/local/bin/ruby -pi
gsub(ARGV[0], ARGV[1])

For this, I'd probably just do
$ /usr/local/bin/ruby -pi -e 'gsub(foo, bar)' somefile



Mike Wilson
Unix Administrator
http://ruby.weblogs.com

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