How to delete a specific line of a text file?

Question

So, I have been browsing tall and high for a solution, but came up short. So, here is my problem:

how do I write a program, that will delete a specific line from a text file?

The information is as follows:

Lukas;11111111;x6 y8
John;22222222;x7 y10
Fred;44444444;x8 y15

The info is basically name, phone number and coordinates.

How would I be able to do delete Fred from this?

I can provide my full code if needed.

Answer 1

The solution for this is simple:

1. read the file into an array
2. remove the lines you want

3. Write the content to a file (preferably a new one)

    #! /usr/bin/env ruby src='/tmp/data.src' dst='/tmp/data.new' content = File.readlines src content = content.grep_v /Fred;/ File.open(dst,'w+') {|f| f.puts content}