Magic

gistfile1.sh

gem install magic

gistfile2.sh

sudo apt-get install file

gistfile3.txt

set PATH=C:\Program Files\GnuWin32\bin;%PATH%

gistfile4.rb

Magic.guess_string_mime(
  "Magic® File™",
  :database => 'C:\Program Files\GnuWin32\share\misc\magic.mgc'
)

gistfile5.rb

require "magic"

Magic.guess_file_mime("public/images/rails.png")
# => "image/png; charset=binary"

Magic.guess_file_mime_encoding("public/images/rails.png")
# => "binary"

Magic.guess_file_mime_type("public/images/rails.png")
# => "image/png"

Magic.guess_string_mime("Magic® File™")
# => "text/plain; charset=utf-8"

Magic.guess_string_mime_encoding("Magic® File™")
# => "utf-8"

Magic.guess_string_mime_type("Magic® File™")
# => "text/plain"

Magic.guess(:mime_type, :database => "/etc/magic") { |db| db.buffer("Magic® File™") }
# => "text/plain"

gistfile6.sh

sudo port install file