How to scan text file for string, and run code if string isn't there?

Question

I have tried:

elsif file.grep(/Mode: 1/)
   puts "test"
else
   puts "test but else"

Codacy is saying this is wrong. Is there a way to improve this? According to Codacy:

unexpected token kELSIF (Using Ruby 2.2 parser; configure using `TargetRubyVersion` parameter, under `AllCops`)

unexpected token kELSE (Using Ruby 2.2 parser; configure using `TargetRubyVersion` parameter, under `AllCops`)

Possible duplicate of What's the best way to search for a string in a file? — Brad Werth
– Brad Werth, Commented Mar 26, 2019 at 20:46

mechnicov · Accepted Answer · 2019-03-26 18:21:20Z

4

You can use IO::read to assign text file content and then String#include? for checking.

file_string = File.read('path/to/file')

if file_string.include?('substring')
  puts 'Yes'
else
  puts 'No'
end

Also you can replace it by String#match? (it is faster).

file_string.match?(/pattern/) will return true or false.

answered Mar 26, 2019 at 18:21

mechnicov

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3 Comments

user11257686 Over a year ago

Thank you so much! you're a true lifesaver. I'm new to ruby, and this helps loads. Thank you!

mechnicov Over a year ago

Glad I could help

Mohammad Fahad Rao Over a year ago

if I want to print something from file it shows blank output even though condition is true as the text matches File.open("fahad.txt","r") do |i| if i.read().include?("major") puts i.read() end end

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