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Java Servlet Example

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Common

https://github.com/dense-analysis/ale https://github.com/liuchengxu/vista.vim#usage

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language: go
go:
  - 1.10.x

install:
  - go get github.com/golang/dep
  - go get golang.org/x/tools/cmd/cover
  - go get github.com/onsi/gomega
  - go install github.com/onsi/ginkgo/ginkgo
  - export PATH=$PATH:$HOME/gopath/bin

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EC2

All instances with max-output

aws ec2 describe-instances --max-items 1

List tags and their names

aws ec2 describe-instances --query 'Reservations[*].Instances[*].Tags[?Key==`Name`]'

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FROM golang:1.8.6-alpine3.5

WORKDIR /app

ADD go-docker /app/

ENTRYPOINT ["./go-docker"]

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Cursor movement

• h - move left
• j - move down
• k - move up
• l - move right
• w - jump by start of words (punctuation considered words) W - jump by words (spaces separate words)
• e - jump to end of words (punctuation considered words)
• E - jump to end of words (no punctuation)
• b - jump backward by words (punctuation considered words) B - jump backward by words (no punctuation)

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main_hash = {}
K = 10000
start_time = Time.now
(1..K).each do |number|
  main_hash = main_hash.merge({number => number})
end
puts "with 'merge'"
puts "Time elapsed #{Time.now - start_time} seconds"
puts "Main hash key count: #{main_hash.keys.count}"

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----------------------------------------------------------------------------------------
 KeyBoard ShortCuts
----------------------------------------------------------------------------------------

: Grep :
grep 'text' /folder/file.log            Regular search (-c adds count, -n adds line no., --color options add color)
grep -i 'text' /folder/file.log         Ignore case
grep -r 'text' /folder/                 search recursively (-h will hide file names)
grep -w 'word' /folder/file.log         search for word only
grep -v 'text' /folder/file.log            Invert search

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require 'pdf/reader'

raw_string = ''
#INSTRUCTION: save it locally http://www.energy.umich.edu/sites/default/files/pdf-sample.pdf
filename = File.expand_path(File.dirname(__FILE__)) + '/pdf-sample.pdf'
PDF::Reader.open(filename) do |reader|
  reader.pages.each do |page|
    raw_string  = page.raw_content
    puts page.raw_content
  end