Mercurial > repos > other > SevenLanguagesInSevenWeeks
annotate 1-Ruby/day2-grep.rb @ 23:720e9201dd98
Add basic grep
| author | IBBoard <dev@ibboard.co.uk> |
|---|---|
| date | Sun, 08 Jan 2017 20:29:18 +0000 |
| parents | |
| children |
| rev | line source |
|---|---|
| 23 | 1 #! /usr/bin/env ruby |
| 2 | |
| 3 if ARGV.length != 2 | |
| 4 abort("Incorrect arguments - pass a single file and a pattern") | |
| 5 elsif not File.exist? (ARGV[0]) | |
| 6 abort ("File #{ARGV[0]} did not exist") | |
| 7 end | |
| 8 | |
| 9 file = ARGV[0] | |
| 10 pattern = Regexp.new(ARGV[1]) | |
| 11 i = 0 | |
| 12 File.open(file, "r").each_line do |line| | |
| 13 i+= 1 | |
| 14 if line =~ pattern then | |
| 15 puts "#{i} #{line}" | |
| 16 end | |
| 17 end |