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comps = ["PC", "MAC", "PC", "PC", "LINUX", "MAC", "DIDAKTIK"]

duplicities = comps.group_by{|x| x.first}.find_all{|k,v| v.size > 1}.map{|x| x.first}

duplicities # => ["MAC","PC"]

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# Usage:
#
#  Then directory "tmp/sample" should have the following tree:
#      """
#        monday
#        | beer.rb
#        tuesday
#        | vodka.php
#        | wine.rb
#        wednesday

iNecas

# Why it is not a good idea to rescue without explicit exception type?
# Because:
#
#  begin
#   "..."
#  rescue
#  end
#
# Handles only StandardError descendants (no Excpetion descendants catched)

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    def get_distribution env, id
      self.repos(env).map do |repo|
        repo.distributions.find_all {|d| d.id == id }
      end
    end

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# Disable ctrl-alt-backpace (restart X11) server.
# Put into /etc/X11/xorg.conf.d

Section "ServerFlags"
    Option "DontZap"  "yes"
EndSection

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unbind C-b
set -g prefix F12

# Use vim-like keys for moving around
bind h select-pane -L
bind j select-pane -D
bind k select-pane -U
bind l select-pane -R
bind C-h select-pane -t :-
bind C-l select-pane -t :+

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*background: black
*foreground: white
xterm*background: #3c3c3c
urxvt*depth: 32
urxvt*background:    rgba:1111/1111/1111/ffff

URxvt.scrollBar: false

URxvt.tabbed.tabbar-fg: 4
URxvt.tabbed.tabbar-bg: -1

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[<<EOS1, <<EOS2, <<EOS3]
This is
an array
EOS1
of very very
very very
EOS2
long strings
EOS3

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# shift indented text to the left as much as possible
def align_indented(text)
  shift_left = text.lines.map { |l| l[/^\s*/].size }.min
  text.lines.map { |l| l[shift_left..-1] }.join
end

puts align_indented(<<TEXT)
  this is some
    indented text
      we would like to

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%w[one two three].each do |method|
  define_method method do |*args|
    "My uebercool method #{method}"
  end
end