From: Skeets <skillet3232@...>
Date: 2006-08-05T15:20:12+09:00
Subject: Re: Simple Reading, Deleting and Writing to Files

James Britt wrote:
> Skeets wrote:
>
> >
> > what i don't know how to do is to...
> >
> > 1. write this data to a newly created file (case: file doesn't exist)
>
> File.open( some_file_name, 'w'){|f| f.puts(the_data)}
>
> > 2. overwrite the data (case: file exists but data needs to be updated).
> You can use the same code.  It will overwrite the current file with the
> new data.
>
> >
> > eg, let's say my ip changed to 127.0.0.2.  i want to delete "#ip
> > 127.0.0.1" and replace it with "#ip 127.0.0.2".  i i'd also consider if
> > deleting just 127.0.0.1 and replacing it with 127.0.0.2 if it makes
> > more sense.
>
> Just overwrite the old file with the new, complete, data.

thanks for the tip.  at first glance, though, i'm thinking i want to
delete only the line(s) that change.  eg, if the i line changes, i
don't want to read in the whole file, i'd prefer to just overwrite the
#ip line.

is this doable?  if so, is it too much trouble for a short file like
this one?

i perused the linked references, but didn't find a way to delete a
specific line and replace it.

thanks again.