Tobi Lehman tlehman

## lan_ip.rb
puts UDPSocket.open { |s| s.connect('www.example.com', 1); s.addr.last }

## jth_bit.c
#include <stdio.h>

#define TWO_TO_THE(POWER) (1 << POWER)
#define JTH_BIT(BITS, J)  ((TWO_TO_THE((J-1)) & BITS) != 0)

int main(int argc, char *argv[]) {
  	printf("JTH_BIT(8, 1) = %d\n", JTH_BIT(8, 1));
  	printf("JTH_BIT(8, 2) = %d\n", JTH_BIT(8, 2));
  	printf("JTH_BIT(8, 3) = %d\n", JTH_BIT(8, 3));
  	printf("JTH_BIT(8, 4) = %d\n", JTH_BIT(8, 4));

## just_ip_addrs.sh
#!/bin/bash
# extract IP addresses from ifconfig command using Perl

if [ "$1" = "-v6" ]; then
  ifconfig | perl -ne '/inet6 addr: (([0-9a-f]*:?)*\/\d+)/ && print "$1\n"'
else
  ifconfig | perl -ne '/addr:((\d{1,3}\.?){4})/ && print "$1\n"'
fi

## gist:57c0e64ba118d55b0a53
Verifying myself: My Bitcoin username is +tlehman. https://onename.io/tlehman

## gpa.rb
def gpa(grades)
  points = {:A => 4.0, :B => 3.0, :C => 2.0, :D => 1.0, :F => 0}
  grade_values = grades.merge(points) { |grade,value,number| (number.to_f)*value }
  numer = grades.values.inject(:+).to_f
  denom = grade_values.values.inject(:+).to_f

  ((numer/denom)*10).round(3)
end
# ==> nil

## proc_lambda_block.rb
a = proc { return 1 }
# ==> #<Proc:0x007f96d280a118@(irb):1>

b = lambda { return 1 }
# ==> #<Proc:0x007f96d3002438@(irb):3 (lambda)>

a.call
# =LocalJumpError: unexpected return
# = from (irb):1:in `block in irb_binding'
# = from (irb):5:in `call'

## multco_election_2014.sh
#!/bin/sh

curl -s https://multco.us/elections/november-2014-general-election-results  |  ruby -e 'STDIN.readlines.each {|line| puts line if /<pre>/ =~ line .. /<\/pre>/ =~ line }'

## superclasses.rb
# Starting with a simple String object:
hello = "Hello, World"

def output_class_hierarchy(object)
  o = object
  while o.class!=Class || (o != nil && o != NilClass)
    if o.is_a? Class
      puts "  #{o} -> #{o.superclass.inspect} [label=superclass,color=red];"
      o = o.superclass
    else

## pad_filenames_zeros
→ ls
file1.txt   file14.txt  file19.txt  file23.txt  file28.txt  file32.txt  file37.txt  file41.txt  file46.txt  file50.txt  file55.txt  file6.txt
file10.txt  file15.txt  file2.txt   file24.txt  file29.txt  file33.txt  file38.txt  file42.txt  file47.txt  file51.txt  file56.txt  file7.txt
file11.txt  file16.txt  file20.txt  file25.txt  file3.txt   file34.txt  file39.txt  file43.txt  file48.txt  file52.txt  file57.txt  file8.txt
file12.txt  file17.txt  file21.txt  file26.txt  file30.txt  file35.txt  file4.txt   file44.txt  file49.txt  file53.txt  file58.txt  file9.txt
file13.txt  file18.txt  file22.txt  file27.txt  file31.txt  file36.txt  file40.txt  file45.txt  file5.txt   file54.txt  file59.txt
~/tmp/files  2014-11-26 12:09:55
→ for f in $(ls); do newnum=$(ruby -e "/file(?<num>\d+).txt/ =~ '$f'; puts num.rjust(2,'0')"); mv $f file$newnum.txt; done
mv: ‘file10.txt’ and ‘file10.txt’ are the same file
mv: ‘file11.txt’ and ‘file11.txt’ are the same file

## git-step-through-commits-follow.sh
git log --pretty="%H" --follow main.py | for commit in $(cat -); do git show $commit; read; done
	#include <stdio.h>

	#define TWO_TO_THE(POWER) (1 << POWER)
	#define JTH_BIT(BITS, J) ((TWO_TO_THE((J-1)) & BITS) != 0)

	int main(int argc, char *argv[]) {
	printf("JTH_BIT(8, 1) = %d\n", JTH_BIT(8, 1));
	printf("JTH_BIT(8, 2) = %d\n", JTH_BIT(8, 2));
	printf("JTH_BIT(8, 3) = %d\n", JTH_BIT(8, 3));
	printf("JTH_BIT(8, 4) = %d\n", JTH_BIT(8, 4));
	#!/bin/bash
	# extract IP addresses from ifconfig command using Perl

	if [ "$1" = "-v6" ]; then
	ifconfig \| perl -ne '/inet6 addr: (([0-9a-f]:?)\/\d+)/ && print "$1\n"'
	else
	ifconfig \| perl -ne '/addr:((\d{1,3}\.?){4})/ && print "$1\n"'
	fi
	def gpa(grades)
	points = {:A => 4.0, :B => 3.0, :C => 2.0, :D => 1.0, :F => 0}
	grade_values = grades.merge(points) { \|grade,value,number\| (number.to_f)*value }
	numer = grades.values.inject(:+).to_f
	denom = grade_values.values.inject(:+).to_f

	((numer/denom)*10).round(3)
	end
	# ==> nil
	a = proc { return 1 }
	# ==> #<Proc:0x007f96d280a118@(irb):1>

	b = lambda { return 1 }
	# ==> #<Proc:0x007f96d3002438@(irb):3 (lambda)>

	a.call
	# =LocalJumpError: unexpected return
	# = from (irb):1:in `block in irb_binding'
	# = from (irb):5:in `call'
	#!/bin/sh

	curl -s https://multco.us/elections/november-2014-general-election-results \| ruby -e 'STDIN.readlines.each {\|line\| puts line if /<pre>/ =~ line .. /<\/pre>/ =~ line }'
	# Starting with a simple String object:
	hello = "Hello, World"

	def output_class_hierarchy(object)
	o = object
	while o.class!=Class \|\| (o != nil && o != NilClass)
	if o.is_a? Class
	puts " #{o} -> #{o.superclass.inspect} [label=superclass,color=red];"
	o = o.superclass
	else
	→ ls
	file1.txt file14.txt file19.txt file23.txt file28.txt file32.txt file37.txt file41.txt file46.txt file50.txt file55.txt file6.txt
	file10.txt file15.txt file2.txt file24.txt file29.txt file33.txt file38.txt file42.txt file47.txt file51.txt file56.txt file7.txt
	file11.txt file16.txt file20.txt file25.txt file3.txt file34.txt file39.txt file43.txt file48.txt file52.txt file57.txt file8.txt
	file12.txt file17.txt file21.txt file26.txt file30.txt file35.txt file4.txt file44.txt file49.txt file53.txt file58.txt file9.txt
	file13.txt file18.txt file22.txt file27.txt file31.txt file36.txt file40.txt file45.txt file5.txt file54.txt file59.txt
	~/tmp/files 2014-11-26 12:09:55
	→ for f in $(ls); do newnum=$(ruby -e "/file(?<num>\d+).txt/ =~ '$f'; puts num.rjust(2,'0')"); mv $f file$newnum.txt; done
	mv: ‘file10.txt’ and ‘file10.txt’ are the same file
	mv: ‘file11.txt’ and ‘file11.txt’ are the same file