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irb(main):004:0> require 'mechanize'
irb(main):005:0> agent = Mechanize.new
irb(main):006:0> p agent.get('google.co.jp')
ArgumentError: absolute URL needed (not google.co.jp)
        from /home/hogeuser/.rbenv/versions/2.2.0-rc1/lib/ruby/gems/2.2.0/gems/mechanize-2.7.3/lib/mechanize/http/agent.rb:651:in `resolve'
        from /home/hogeuser/.rbenv/versions/2.2.0-rc1/lib/ruby/gems/2.2.0/gems/mechanize-2.7.3/lib/mechanize/http/agent.rb:223:in `fetch'
        from /home/hogeuser/.rbenv/versions/2.2.0-rc1/lib/ruby/gems/2.2.0/gems/mechanize-2.7.3/lib/mechanize.rb:440:in `get'
        from (irb):6
        from /home/hogeuser/.rbenv/versions/2.2.0-rc1/bin/irb:11:in `<main>'

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sudo chmod 0664 /dev/sr0

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gem 'sinatra' , '1.4.6'
group :production do
  gem 'thin'
end

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#!/usr/bin/env python

import os
import json

def json_tree(path):
    target_json = []

    for item in os.listdir(path):
        new_hash = {}

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# Python2

import re
str = 'これは漢字を含みます'
re.search('[\xE4B880-\xE98CAC]', str)

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# Install Emacs
# 面倒であれば、aptから入れても良い
#sudo apt-get install emacs
cd /usr/local/src
sudo wget http://ftp.jaist.ac.jp/pub/GNU/emacs/emacs-24.5.tar.gz
sudo tar xzvf emacs-24.5.tar.gz && sudo rm emacs-24.5.tar.gz
cd emacs-24.5
./configure --with-x-toolkit=no --with-xpm=no --with-jpeg=no --with-gif=no --with-tiff=no
make
sudo make install

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# この関数を~/.bash_aliasesなどに書いておく
alarm(){
    echo "echo $1 | cowsay | wall" | at $2
}

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virtualenv -p python3 env
source env/bin/activate
pip3 install fabric3

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cat <<EOF > test.txt
a b c
d e f
EOF

# cutを使う場合
cat test.txt | cut -d ' ' -f 1,3
#=> a c
#=> d f

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k-gosho@kgosho-ubuntu ~ % cat languages.txt
id,name
1,"Ruby"
2,"Perl"
3,"PHP"