Use Ruby to Prefix all lines /Postfix all lines/Remove empty lines/Replace strings in all lines of a file

For some reason or the other I had to do bulk operations on files, like prefix/postfix all lines or remove empty lines
, yeah I could do it with some unix command, but I am already using ruby to massage the data just wanted to extand that.So here
is what I did wrote a ruby script to do it now I can do stuff like

prefix ( ‘c:\tmp\zip.txt’,’some-prefix’ )

The script, hmmm I wonder if I could submit this to ruby people.

require 'fileutils'
module DevFileutils include FileUtils::Verbose # Opens a file and adds prefix to each line def prefix file_name, prefix temp = File.new(file_name+".tmp", 'a+') IO.foreach(file_name) do |line| temp.puts prefix + line end temp.close mv file_name+'.tmp', file_name end # Opens a file and adds postfix to each line def postfix file_name, postfix temp = File.new(file_name+".tmp", 'a+') IO.foreach(file_name) do |line| temp.puts line.chomp + postfix end temp.close mv file_name+'.tmp', file_name end #removes all empty lines from a file def remove_empty_lines file_name temp = File.new(file_name+".tmp", 'a+') IO.foreach(file_name) do |line| temp.puts line if !line.chomp.empty? end temp.close mv file_name+'.tmp', file_name end def replace file_name,string,with_string temp = File.new(file_name+".tmp", 'a+') IO.foreach(file_name) do |line| temp.puts line.gsub(string,with_string) end temp.close mv file_name+'.tmp', file_name end end