From: Mark Probert <probertm@...>
Date: 2004-08-19T10:45:54+09:00
Subject: Ruby way to update file lines

Hi.

I have a need to update a config file.  It uses '#' as a line comment 
marker.  The config file looks like:

 # file comment
 #
 name1:foo1:bar:other 
 name2:foo2:bar:other
 name3:foo3:bar:other
 name4:foo4:bar:other

The name:foo combination is unique.

What is the most efficient way to read in the file, update the line, and 
then write it back to the file.  One update would be to place a '#' in col 
1

 #name3:foo3:bar:other

Any thoughts appreciated.

-mark.