Mr. Black

Mr. Black has asked 18 questions and find answers to 5 problems.

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Mr. Black questions

ruby- define modules dynamically
How to count command line arguments in expect script?
Sort and list the files from a directory in numeric order
Skip email confirmation when creating a new user using Devise
Split string from the second occurrence of the character
HTML page to PDF converter in Ruby? [closed]
rails 4.2.0: can't install pg gem on ubuntu 14.04
How to set default rails version for a project?
Difference between plugins and Ruby gems?
How to group by count in array without using loop

Mr. Black answers

SystemStackError (stack level too deep)
How to validate a credit card number
Specific difference between bufferedreader and filereader
Fatal error: Call to undefined function ssh2_connect() - Redhat OS