1-liners for Ruby local servers (not rails). I use these for tutorials, quick access to demo front-end code, etc.

ruby_server_1_liners.rb

#
# The simplest one liners are using ruby/lib/un.rb methods.
#

# @n0kada and @tenderlove's one liner is darn simple, but doesn't play nice with my OSX's ruby 1.8.7 defaults.
# Set your local rubies to 1.9.3 or greater (which you should be running anyway) and it's all good.

ruby -run -e httpd . -p 5000

#
# Starts WEBrick (works for me with 1.8.7 and up)
# The more verbose one liners are running webrick and executing some command line scripts.
# These are pretty verbose for a 1-liner and a sign you should consider using a script file.
#

# Starts WEBrick 
# This won't work unless you have a handler for "/"

ruby -rwebrick -e'WEBrick::HTTPServer.new(:Port => 3000).start'

# Starts WEBrick with directory listing 

ruby -rwebrick -e'WEBrick::HTTPServer.new(:Port => 3000, :DocumentRoot => Dir.pwd).start'

# Starts WEBrick with directory listing and svg support
# This version adds mime-type handler for SVG so we can select *.svg from directory listing and view in the browser

ruby -rwebrick -e'my_mime_types = WEBrick::HTTPUtils::DefaultMimeTypes; my_mime_types.store("svg","image/svg+xml");WEBrick::HTTPServer.new(:Port => 3000, :DocumentRoot => Dir.pwd, :mime_types =>my_mime_types).start'

# This version adds mime-type handler for web fonts
ruby -rwebrick -e'my_mime_types = WEBrick::HTTPUtils::DefaultMimeTypes; my_mime_types.store("ttf","application/x-font-ttf"); my_mime_types.store("otf","application/x-font-opentype"); my_mime_types.store("svg","image/svg+xml");WEBrick::HTTPServer.new(:Port => 5000, :DocumentRoot => Dir.pwd, :mime_types =>my_mime_types).start'