begin29

# run specific test
ruby my_test -n test_my_test

begin29

# linux symbols 
http://panmental.de/symbols/info.htm

#shows special keys matching(alt, ctrl, win)
xmodmap

# for windows, setup diff windows on start
https://faq.i3wm.org/question/243/how-do-i-use-an-exclude-regex-in-i3-config/%3C/p%3E.html

# back workspace to external monitor

begin29

# always restart code like in development
touch tmp/always_restart.txt

# restart only once
touch tmp/restart.txt

begin29

# show files that will be removed
git clean -n
# remove files
git clean -f
#To remove directories, run 
git clean -f -d #or git clean -fd
#To remove ignored files, run 
git clean -f -X #or git clean -fX
#To remove ignored and non-ignored files, run 
git clean -f -x #or git clean -fx

begin29

class Figure

  attr_reader :radius

  def initialize(color,radius)
    @color = color
    @radius = radius
    raise "first argument needs to be a string" unless color.class  == String
    raise "second argument needs to be a fixnum" unless radius.class  == Fixnum
  end

begin29

http://www.junauza.com/2010/04/remote-control-your-linux-desktop-using.html

# if auth error 18 happends
# need to allow plain auth for clients
gsettings set org.gnome.Vino require-encryption false

begin29

# search `pattern name` recursivelly from current folder
# only in css files 
grep --include=\*.css -rnw ./ -e "pattern name"

# search word error
grep -i error /var/log/kern.log

begin29

# show indexes
show INDEXES from table_name

when I should add index?
#when selectivity is big
selectivity = count of variations/all rows * 100%
#selectivity for sex column is low: sel_of_sex = 2(male, female)/10000 *100 = 0.02%
#http://www.programmerinterview.com/index.php/database-sql/selectivity-in-sql-databases/

begin29

require 'net/http'
str = "https://some_cool_url"

uri = URI.parse(str)
http = Net::HTTP.new(uri.host, uri.port)
request = Net::HTTP::Get.new(uri.request_uri)
http.use_ssl = true
response = http.request(request)
p response.body

begin29

require 'benchmark'

iterations = 100_000

Benchmark.bm(27) do |bm|
  bm.report('finding in hash') do
    iterations.times do
      arr.find{|h| h['start_date'] == '2018'}
    end
  end