# Ruby tips

# Rubyで時間を扱う
    puts "Current Time : " + time.inspect
    puts time.year    # => Year of the date
    puts time.month   # => Month of the date (1 to 12)
    puts time.day     # => Day of the date (1 to 31 )
    puts time.wday    # => 0: Day of week: 0 is Sunday
    puts time.yday    # => 365: Day of year
    puts time.hour    # => 23: 24-hour clock
    puts time.min     # => 59
    puts time.sec     # => 59
    puts time.usec    # => 999999: microseconds
    puts time.zone    # => "UTC": timezone name

    time = Time.new

    puts time.to_s
    # => Mon Jun 02 12:35:19 -0700 2008
    puts time.ctime
    # => Mon Jun  2 12:35:19 2008
    puts time.localtime
    # => Mon Jun 02 12:35:19 -0700 2008
    puts time.strftime("%Y-%m-%d %H:%M:%S")
    # => 2008-06-02 12:35:19
# エスケープ文字一覧
    ### Backslash notation  Hexadecimal character   Description

    - \a                  0x07                    Bell or alert
    - \b                  0x08                    Backspace
    - \cx                                         Control-x
    - \C-x                                        Control-x
    - \e                  0x1b                    Escape
    - \f                  0x0c                    Formfeed
    - \M-\C-x                                     Meta-Control-x
    - \n                  0x0a                    Newline
    - \nnn                                        Octal notation, where n is in the range 0-7
    - \r                  0x0d                    Carriage return
    - \s                  0x20                    Space
    - \t                  0x09                    Tab
    - \v                  0x0b                    Vertical tab
    - \x                                          Character x
    - \xnn                                        Hexadecimal notation, where n is in the range 0-9, a-f, or A-F
# ローカルのgemを全部アンインストールする
    gem uninstall -axI `gem list --no-versions | egrep -v 'test-unit|rdoc|psych|minitest|io-console|rake|bigdecimal|json'`