jvmvik

# simple fibonnaci benchmark 
#
require 'benchmark'

def fib(n)
 if n == 1
  1
 elsif n == 2
  1
 else

jvmvik

#!/usr/bin/env ruby
#
# Convert CD to mp3 on Linux
#
# reference: https://www.cyberciti.biz/faq/linux-ripping-and-encoding-audio-files/
#
# Run extraction with
#   cdparanoia -B
#
# Convert wav to mp3 with lame

jvmvik

require 'yaml'
require 'erb'

# render a template
# @param [String] s template
# @param [Binding] ctx binding context
# @return [String] render output
def render(s, ctx)
  begin
   erb = ERB.new(s)

jvmvik

# Makefile flash card
#

# check if file exist
ifneq ("$(wildcard $(path))","")
FILE_EXISTS = 1
else
FILE_EXISTS = 0
endif

jvmvik

# USAGE: Hash.from_xml(YOUR_XML_STRING)require 'rubygems'
require 'nokogiri'
# modified from http://stackoverflow.com/questions/1230741/convert-a-nokogiri-document-to-a-ruby-hash/1231297#123129
7

class Hash
  class << self
    def from_xml(xml_io)
      begin
        result = Nokogiri::XML(xml_io)

jvmvik

// Go grep parallel
// https://golang.hotexamples.com/examples/codesearch.regexp/Grep/File/golang-grep-file-method-examples.html

func main() {
	var g regexp.Grep
	g.AddFlags()
	g.Stdout = os.Stdout
	g.Stderr = os.Stderr
	flag.Usage = usage
	flag.Parse()

jvmvik

#!/usr/bin/env ruby
#
# run gtar in parallel
#
l = Dir.glob("summary/*")
names = l.map { |e| File.basename(e[0]).split("_")[0] }.uniq
list = names.map do |user|
 spawn(%Q(gtar cvf archive+#{user}_2019-11-14.tgz log/#{user}*.log))
end

jvmvik

Pratical CURL commands

return not 0 exit code if http status != 200

curl --silent --show-error --fail URL

• --silent hides the progress and error
• --show-error shows the error message hidden by --silent
• --fail returns an exit code > 0 when the request fails

jvmvik

Search for file duplicates.

$> fdupes

Find file > 10M

$> find . -type f -size +10M

jvmvik

/*
 * Generate gift paper from random images.
 */

package main

import (
	"fmt"
	"image"
	"image/jpeg"