Modules and Libraries

• Metasploit Framework
• Rails
• Solidus

FAQ

How to list rake tasks?

rake -T

• https://batsov.com/articles/2012/03/08/ruby-tip-number-2-get-a-list-of-all-rake-tasks/ (opens new window)
• https://ruby.github.io/rake/ (opens new window)

How to use map() function?

[1,2,3].map{ |x| puts(x) }
# return [nil, nil, nil]

[1,2,3].map{ |x| x+1 }
# return [2,3,4]

• https://www.rubyguides.com/2018/10/ruby-map-method/ (opens new window)

How to find a gems?

By executing gem locally

gem search ${package_name}

By using official ruby gems website:

• https://rubygems.org

How to set ruby environment variable?

• RUBYLIB: A colon-separated list of directories that are added to Ruby's library load path ($:). Directories from this environment variable are searched before the standard load path is searched. e.g.: RUBYLIB="$HOME/lib/ruby:$HOME/lib/rubyext"

• RUBYOPT: Additional Ruby options. e.g. RUBYOPT="-w -Ke". Note that RUBYOPT can contain only -d, -E, -I, -K, -r, -T, -U, -v, -w, -W, --debug, --disable-FEATURE and --enable-FEATURE.

• RUBYPATH: A colon-separated list of directories that Ruby searches for Ruby programs when the -S flag is specified. This variable precedes the PATH environment variable.

• RUBYSHELL: The path to the system shell command. This environment variable is enabled for only mswin32, mingw32, and OS/2 platforms. If this variable is not defined, Ruby refers to COMSPEC.

• PATH: Ruby refers to the PATH environment variable on calling Kernel#system.

• https://manpages.debian.org/buster/ruby/ruby.1.en.html (opens new window)

• https://manpages.debian.org/buster/ruby-bundler/bundle.1.en.html (opens new window)

• https://ruby.github.io/rake/ (opens new window)

• https://bundler.io/v1.16/bundle_config.html#LIST-OF-AVAILABLE-KEYS (opens new window)

• https://www.digitalocean.com/community/tutorials/how-to-install-ruby-and-set-up-a-local-programming-environment-on-ubuntu-16-04 (opens new window)

• https://www.rubyguides.com/2019/01/ruby-environment-variables/ (opens new window)

Where bundle is storing its configuration by default?

.bundle/config

How to deal with backtrace?

• https://ruby-doc.org/core-2.7.0/Exception.html (opens new window)
• https://blog.appsignal.com/2018/02/06/reading-and-understanding-ruby-stack-traces.html (opens new window)
• https://blog.appsignal.com/2018/02/06/reading-and-understanding-ruby-stack-traces.html (opens new window)
• https://github.com/yegor256/backtrace (opens new window)