André Durão andredurao

## iptables-cheatsheet.md

      
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                iptables-cheatsheet
              
          
    The netfilter hooks in the kernel and where they hook in the packet flow

The figure below calls out

The netfilter hooks
The order of table traversal


## macos-virtualbox-ubuntu-server-docker.md

      
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                kevin-smets
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                macOS VirtualBox headless Ubuntu Server and Docker setup
              
          
    Get started

Install virtualbox and the extension pack:
brew install --cask docker virtualbox virtualbox-extension-pack

Download the ubuntu server image and create a VBox for it, the rest of the readme assumes it is named "Ubuntu Server".
Enable SSH


## postgres-cheatsheet.md

      
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                Kartones
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                PostgreSQL command line cheatsheet
              
          
    PSQL

Magic words:
psql -U postgres
Some interesting flags (to see all, use -h or --help depending on your psql version):

-E: will describe the underlaying queries of the \ commands (cool for learning!)
-l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)


## gist:7360908

      
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                Complete list of github markdown emoji markup
              
          
    People


 :bowtie:
😄 :smile:
😆 :laughing:


😊 :blush:
😃 :smiley:
☺️ :relaxed:


😏 :smirk:
😍 :heart_eyes:
😘 :kissing_heart:


😚 :kissing_closed_eyes:
😳 :flushed:
😌 :relieved:


😆 :satisfied:
😁 :grin:
😉 :wink:


😜 :stuck_out_tongue_winking_eye:
😝 :stuck_out_tongue_closed_eyes:
😀 :grinning:


😗 :kissing:
😙 :kissing_smiling_eyes:
😛 :stuck_out_tongue:


## web-servers.md

      
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                willurd
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                Big list of http static server one-liners
              
          
    Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.
Discussion on reddit.
Python 2.x

$ python -m SimpleHTTPServer 8000

  
## cpf_cnpj_validators.rb
#------------------------------------------------------------------------------
# Rotinas para verificação de CPF e CNPJ
# Linguagem: Ruby
# Escrito por: André Camargo < andre@boaideia.inf.br > http://blog.boaideia.inf.br
# Use, copie, melhore a vontade! Patches são bem-vindos...
#------------------------------------------------------------------------------
def check_cpf(cpf=nil)
  return false if cpf.nil?

  nulos = %w{12345678909 11111111111 22222222222 33333333333 44444444444 55555555555 66666666666 77777777777 88888888888 99999999999 00000000000}
`:bowtie:`	😄 `:smile:`	😆 `:laughing:`
😊 `:blush:`	😃 `:smiley:`	☺️ `:relaxed:`
😏 `:smirk:`	😍 `:heart_eyes:`	😘 `:kissing_heart:`
😚 `:kissing_closed_eyes:`	😳 `:flushed:`	😌 `:relieved:`
😆 `:satisfied:`	😁 `:grin:`	😉 `:wink:`
😜 `:stuck_out_tongue_winking_eye:`	😝 `:stuck_out_tongue_closed_eyes:`	😀 `:grinning:`
😗 `:kissing:`	😙 `:kissing_smiling_eyes:`	😛 `:stuck_out_tongue:`
	#------------------------------------------------------------------------------
	# Rotinas para verificação de CPF e CNPJ
	# Linguagem: Ruby
	# Escrito por: André Camargo < andre@boaideia.inf.br > http://blog.boaideia.inf.br
	# Use, copie, melhore a vontade! Patches são bem-vindos...
	#------------------------------------------------------------------------------
	def check_cpf(cpf=nil)
	return false if cpf.nil?

	nulos = %w{12345678909 11111111111 22222222222 33333333333 44444444444 55555555555 66666666666 77777777777 88888888888 99999999999 00000000000}