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Short Introduction to ruby RubyMonk
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Excellent guide to grok main nuances/details in Rub language RubyKoans
OBS. The download link seems broken. Use https://github.com/tibbon/ruby-koans instead
git config --global alias.co checkout
git config --global alias.br branch
git config --global alias.ci commit
git config --global alias.st status
git config --global alias.unstage "reset HEAD"
git config --global alias.lg `log --color --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --abbrev-commit`autocomplete: completion.bash in https://git-scm.com/book/en/v1/Git-Basics-Tips-and-Tricks