Remove all dead links, close #1257
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		| @@ -1143,7 +1143,6 @@ See also [TeX](#tex) | ||||
| * [Ad Hoc Data Analysis From The Unix Command Line](http://en.wikibooks.org/wiki/Ad_Hoc_Data_Analysis_From_The_Unix_Command_Line) | ||||
| * [Advanced Linux Programming](http://www.advancedlinuxprogramming.com/) | ||||
| * [Automated Linux From Scratch](http://www.linuxfromscratch.org/alfs/download.html) | ||||
| * [Cross Linux From Scratch](http://trac.cross-lfs.org/wiki/download#CurrentStable) | ||||
| * [Getting Started with Ubuntu](http://ubuntu-manual.org/) | ||||
| * [GNU Autoconf, Automake and Libtool](http://sources.redhat.com/autobook/download.html) | ||||
| * [GTK+/Gnome Application Development](http://www.linuxtopia.org/online_books/gui_toolkit_guides/gtk+_gnome_application_development/index.html) | ||||
| @@ -1318,8 +1317,6 @@ See also [TeX](#tex) | ||||
|  | ||||
|  | ||||
| ### Oracle PL/SQL | ||||
| * [PL/SQL Language Reference](http://download.oracle.com/docs/cd/E11882_01/appdev.112/e17126/toc.htm) | ||||
| * [PL/SQL Packages and Types Reference](http://download.oracle.com/docs/cd/E11882_01/appdev.112/e16760/toc.htm) | ||||
|  | ||||
|  | ||||
| ### Oracle Server | ||||
| @@ -1570,11 +1567,7 @@ See also [TeX](#tex) | ||||
|  | ||||
|  | ||||
| ### Ruby | ||||
| * [Ruby in Twenty Minutes](https://www.ruby-lang.org/en/documentation/quickstart/) | ||||
| * [Programming Ruby](http://www.ruby-doc.org/docs/ProgrammingRuby/) | ||||
| * [Ruby Learning](http://rubylearning.com/) | ||||
| * [A community-driven Ruby style guide](https://github.com/bbatsov/ruby-style-guide) | ||||
| * [Ruby User's Guide](http://www.rubyist.net/~slagell/ruby/) | ||||
| * [CodeCademy Ruby](http://www.codecademy.com/tracks/ruby) | ||||
| * [Developing Games With Ruby](https://leanpub.com/developing-games-with-ruby/read) | ||||
| * [I Love Ruby](http://goo.gl/1qrMUN) | ||||
| @@ -1583,13 +1576,16 @@ See also [TeX](#tex) | ||||
| * [Learn to Program, by Chris Pine](http://pine.fm/LearnToProgram/) | ||||
| * [Mr. Neighborly's Humble Little Ruby Book](http://www.humblelittlerubybook.com/) | ||||
| * [Practicing Ruby](https://github.com/elm-city-craftworks/practicing-ruby-manuscripts) | ||||
| * [Programming Ruby](http://www.ruby-doc.org/docs/ProgrammingRuby/) | ||||
| * [Read Ruby](http://readruby.io/) | ||||
| * [Ruby Essentials](http://www.techotopia.com/index.php/Ruby_Essentials) | ||||
| * [Ruby Hacking Guide](http://ruby-hacking-guide.github.io/) | ||||
| * [Ruby in Twenty Minutes](https://www.ruby-lang.org/en/documentation/quickstart/) | ||||
| * [Ruby Koans](http://www.rubykoans.com/) | ||||
| * [Ruby Learning](http://rubylearning.com/) | ||||
| * [Ruby Programming](http://www.linuxtopia.org/online_books/programming_books/ruby_tutorial/) | ||||
| * [Ruby User's Guide](http://www.rubyist.net/~slagell/ruby/) | ||||
| * [The Bastards Book of Ruby](http://ruby.bastardsbook.com/) | ||||
| * [The Little Book Of Ruby](http://www.sapphiresteel.com/ruby-programming/The-Little-Book-Of-Ruby.html) | ||||
| * [The Unofficial Ruby Usage Guide (at Google)](http://www.caliban.org/ruby/rubyguide.shtml) - Ian Macdonald | ||||
| * [Why's (Poignant) Guide to Ruby](http://mislav.uniqpath.com/poignant-guide/) ([mirror](http://www.scribd.com/doc/2236084/Whys-Poignant-Guide-to-Ruby)) | ||||
|  | ||||
| @@ -1795,7 +1791,6 @@ See also [LaTeX](#latex) | ||||
|  | ||||
| ### Vim | ||||
| * [A Byte of Vim](http://www.swaroopch.com/notes/vim/) | ||||
| * [A guide to getting started with VIM](http://www.integralist.co.uk/posts/a-guide-to-getting-started-with-vim/) | ||||
| * [Learn Vim Progressively](http://yannesposito.com/Scratch/en/blog/Learn-Vim-Progressively/) | ||||
| * [Learn Vimscript the Hard Way](http://learnvimscriptthehardway.stevelosh.com/) | ||||
| * [Use Vim Like A Pro](https://leanpub.com/VimLikeAPro) *(Leanpub, by Tim Ottinger)* | ||||
|   | ||||
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