Question

I want to write a program that get from user a path and then go to that directory and all of subdirectories recurcively and collect all txt files. but “.” and “..” bother me when I am iterating directories recurcively. please help me to eradicating this problem.
this is my code :

def detect_files(path)
            Dir.foreach(path) do |i|
        if (i != "." or i !="..")
            if (File.directory?(i))
                detect_files(i)
            end
            if (i.reverse.start_with?("txt."))
                @files[i]=[]
            end
        end
    end

end

Answer 1

The condition should be :

if (i != "." and i != "..")

• If i="." then i != "." will be false making the condition false, and "." will not be processed
• If i=".." then i != "." will be true but i != ".." will be false, making the condition false and ".." will not be processed.
• If i has any other values, then both side of and will be true and the body of if will be executed.