Fabric SSH With Keyfile

To configure fabric to connect to remote hosts using SSH keyfiles on Amazon EC2 instances.

add the following after REPO_URL (If you are following OBTTG Tutorial : Chapter 11):

REPO_URL = 'https://github.com/XXX/YYY'
env.user = "ubuntu"
env.key_filename = ["/path/to/key/keypair.pem"]
env.hosts = ["xxx-xx-xxx-xxx.ap-southeast-1.compute.amazonaws.com"]

REPO_URL = 'https://github.com/XXX/YYY'

env.user = "ubuntu"

env.key_filename = ["/path/to/key/keypair.pem"]

env.hosts = ["xxx-xx-xxx-xxx.ap-southeast-1.compute.amazonaws.com"]

Category: Notes

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Context Manager ‘with statement’

November 13, 2018November 17, 2018 Written by Albert

Following the Python TDD study track, I came across an older reference(but still relevant) explanation of what a context manager is. I will do a full write up when I have a chance. Python 2.5 : The ‘with’ statement https://docs.python.org/release/2.5/whatsnew/pep-343.html == Have to spend a whole day to rewrite this explanation == Writing Context Managers […]

Audience: Population 0

December 7, 2017December 7, 2017 Written by Albert

157784760 seconds into the future, the trajectory of consistent improvement will adjust ever so slightly. There is a lot of work to be done. I have never had a consistent web journal prior to this[1] (Well this is not consistent, if you think 2 days is suffice). Always lasted at the most a few months. […]

grep Command for a specific string excluding subset string

November 4, 2018November 4, 2018 Written by Albert

grep -rnw “superlists.settings” -e “DJANGO_SETTINGS” Explanation of flags:

 -r, --recursive
              Read all files under each directory, recursively, following
              symbolic links only if they are on the command line.  Note
              that if no file operand is given, grep searches the working
              directory.

-r, --recursive

Read all files under each directory, recursively, following

symbolic links only if they are on the command line. Note

that if no file operand is given, grep searches the working

directory.

  -n, --line-number
              Prefix each line of output with the 1-based line number within
              its input file.

-n, --line-number

Prefix each line of output with the 1-based line number within

its input file.

 -w, --word-regexp
              Select only those lines containing matches that form whole
              words.  The test is that the matching substring must either be
              at the beginning of the line, or preceded by a non-word
              constituent character.  Similarly, it must be either at the
              end of the line or followed by a non-word constituent
              character.  Word-constituent characters are letters, digits,
              and the underscore.  This option has no effect if <b>-x </b>is also
              specified.

-w, --word-regexp

Select only those lines containing matches that form whole

words. The test is that the matching substring must either be

at the beginning of the line, or preceded by a non-word

constituent character. Similarly, it must be either at the

end of the line or followed by a non-word constituent

character. Word-constituent characters are letters, digits,

and the underscore. This option has no effect if -x is also

specified.

Matching Control
       -e PATTERNS, --regexp=PATTERNS 
              Use <i>PATTERNS</i> as the patterns. If this option is used multiple times 
              or is combined with the <b>-f </b>(<b>--file</b>) option, search for all patterns given. 
              This option can be used to protect a pattern beginning with “-”.

Matching Control

-e PATTERNS, --regexp=PATTERNS

Use PATTERNS as the patterns. If this option is used multiple times

or is combined with the -f (--file) option, search for all patterns given.

This option can be used to protect a pattern beginning with “-”.

“Hello, World!” via Exercism: A Rubyist Greeting

October 30, 2017December 6, 2017 Written by Albert

module HelloWorld
   def self.hello(persons_name)
      if name == persons_name 
      elsif 
      	 name ="World"
      end
         "Hello, #{name}!"
   end
end

# b=true
# puts "blah" if a=b

module HelloWorld

def self.hello(persons_name)

if name == persons_name

elsif

name ="World"

end

"Hello, #{name}!"

end

# b=true

# puts "blah" if a=b

module HelloWorld
   def self.hello(persons_name)
      if name == persons_name 
      else 
      	 name ="World"
         "Hello, #{name}!"
      end
   end
end

module HelloWorld

def self.hello(persons_name)

if name == persons_name

else

name ="World"

"Hello, #{name}!"

end

class HelloWorld
   def self.hello(name = persons_name)
       "Hello, World!"
   end
end

class HelloWorld

def self.hello(name = persons_name)

"Hello, World!"

end