The document discusses the principles of creating good software, emphasizing the importance of usability and maintainability while avoiding complexities like bugs and hard-to-understand code. It highlights examples of using command line tools on Linux for log analysis and provides insights on programming philosophy, particularly the relationship between programs. Additionally, the document includes examples of common commands used in software development, particularly in the context of version control with Git.

1. P O R Q U E V I M ?
A U G U S T O PA S C U T T I
Sebastião Salgado

2. V O C Ê D E V E R I A U S A R
V I M ?

3. V O C Ê D E V E R I A U S A R
V I M ?
N Ã O

5. B O M S O F T WA R E
N O S S O O B J E T I V O É S E M P R E P R O D U Z I R :
Edward Weston

6. O Q U E É U M
B O M
S O F T WA R E ?

7. O Q U E FA Z U M S O F T WA R E R U I M ?
• Bugs
• Difícil de usar
• Código difícil:
• De entender
• De estender
• De mudar

8. C O M O C R I A R
B O M
S O F T WA R E ?

9. “ C O M O
C O Z I N H A R
B E M ? ”

10. “ C O M A
B O A
C O M I D A ”

11. L I N U X
E X I S T E M B O N S E X E M P L O S D E S O F T WA R E ?
Sebastião Salgado

12. – R O B P I K E
“The heart of Unix philosophy is the idea that the
power of a system comes more from the
relationships among programs than from the
programs themselves.”

13. I M P O N D O L I M I T E S
• Passar o máximo de tempo possível na shell.
• Evitar root. Customizar pouco.
• Otimizar sempre.

14. E X E M P L O S

15. A N A LY T I C S

16. #!/bin/bash
[~/Apache] $ cat /var/log/apache2/access.log

17. 220.181.108.101 - - [20/Jun/2012:19:31:01 +0200] "GET / HTTP/1.1" 200 912 "-" "Mozilla/5.0 (compatible;
Baiduspider/2.0; +http://www.baidu.com/search/spider.html)"
123.125.68.79 - - [20/Jun/2012:19:53:24 +0200] "GET / HTTP/1.1" 200 625 "-" "Mozilla/5.0 (compatible;
Baiduspider/2.0; +http://www.baidu.com/search/spider.html)"
178.154.210.252 - - [20/Jun/2012:19:54:10 +0200] "GET /?C=S;O=A HTTP/1.1" 200 663 "-" "Mozilla/5.0
(compatible; YandexBot/3.0; +http://yandex.com/bots)"
74.125.126.102 - - [20/Jun/2012:20:15:28 +0200] "GET / HTTP/1.1" 200 606 "http://www.google.com/url?
sa=t&rct=j&q=error&source=web&cd=1&ved=0CFAQFjAG&url=http%3A%2F%2Fwww.isrolab.com
%2F&ei=GxPiT5PsL4e04AHPtgE&usg=AFQjCNHnmjmdkUV584ORIpOXz7zAPX0UHQ" "Mozilla/4.0 (compatible; MSIE 7.0; Windows
NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; InfoPath.2; .NET
CLR 3.0.4506.2152; .NET CLR 3.5.30729)"
74.125.126.103 - - [20/Jun/2012:20:15:29 +0200] "GET /icons/blank.gif HTTP/1.1" 200 383 "http://
www.isrolab.com/" "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR
2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; InfoPath.2; .NET CLR 3.0.4506.2152; .NET CLR
3.5.30729)"
74.125.126.93 - - [20/Jun/2012:20:15:29 +0200] "GET /icons/folder.gif HTTP/1.1" 200 460 "http://
www.isrolab.com/" "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR
2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; InfoPath.2; .NET CLR 3.0.4506.2152; .NET CLR
3.5.30729)"
74.125.126.82 - - [20/Jun/2012:20:15:30 +0200] "GET /favicon.ico HTTP/1.1" 404 449 "-" "Mozilla/4.0
(compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR
3.5.21022; InfoPath.2; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)"
184.82.92.239 - - [20/Jun/2012:21:03:44 +0200] "GET /logs/access.log HTTP/1.1" 200 2519 "http://isrolab.com/"
"Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT
5.1; SV1) ; .NET CLR 3.5.30729)"
173.236.21.106 - - [20/Jun/2012:21:16:22 +0200] "GET /robots.txt HTTP/1.0" 404 488 "-" "Mozilla/5.0
(compatible; MJ12bot/v1.4.3; http://www.majestic12.co.uk/bot.php?+)"
173.236.21.106 - - [20/Jun/2012:21:16:23 +0200] "GET / HTTP/1.0" 200 621 "-" "Mozilla/5.0 (compatible;
MJ12bot/v1.4.3; http://www.majestic12.co.uk/bot.php?+)"
213.186.122.2 - - [20/Jun/2012:21:27:53 +0200] "GET /logs/?C=D;O=D HTTP/1.1" 200 658 "-" "Mozilla/5.0
(compatible; AhrefsBot/3.0; +http://ahrefs.com/robot/)"
66.249.72.65 - - [20/Jun/2012:21:28:00 +0200] "GET /robots.txt HTTP/1.1" 404 508 "-" "Mozilla/5.0 (compatible;
Googlebot/2.1; +http://www.google.com/bot.html)"
66.249.72.65 - - [20/Jun/2012:21:28:00 +0200] "GET /logs/ HTTP/1.1" 200 723 "-" "Mozilla/5.0 (compatible;
Googlebot/2.1; +http://www.google.com/bot.html)"
123.125.71.44 - - [20/Jun/2012:21:38:57 +0200] "GET / HTTP/1.1" 200 913 "-" "Mozilla/5.0 (compatible;
Baiduspider/2.0; +http://www.baidu.com/search/spider.html)"
220.181.108.88 - - [20/Jun/2012:21:39:48 +0200] "GET / HTTP/1.1" 200 913 "-" "Mozilla/5.0 (compatible;
Baiduspider/2.0; +http://www.baidu.com/search/spider.html)"
178.154.210.252 - - [20/Jun/2012:21:45:12 +0200] "GET /logs/ HTTP/1.1" 200 728 "-" "Mozilla/5.0 (compatible;
YandexBot/3.0; +http://yandex.com/bots)"
139.18.2.209 - - [20/Jun/2012:22:31:43 +0200] "GET / HTTP/1.1" 200 912 "-" "findlinks/2.6 (+http://
wortschatz.uni-leipzig.de/findlinks/)"

18. #!/bin/bash
[~/Apache] $ wc -l access.log
65063 access.log

19. #!/bin/bash
[~/Apache] $ grep "HTTP/1.1" access.log | wc -l
52129

20. #!/bin/bash
[~/Apache] $ tail -n 1 access.log
192.210.213.91 - - [08/Jun/2014:19:42:34 -0700] "GET /logs/
access.log HTTP/1.1" 200 4663 "http://redlug.com/"
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_4)
AppleWebKit/536.30.1 (KHTML, like Gecko) Version/6.0.5
Safari/536.30.1" "redlug.com"

21. #!/bin/bash
[~/Apache]$ head -n 1 access.log
1.202.218.8 - - [20/Jun/2012:19:05:12 +0200] "GET /
robots.txt HTTP/1.0" 404 492 "-" ""Mozilla/5.0"

22. #!/bin/bash
[~/Apache]$ head -n 1 access.log
1.202.218.8 - - [20/Jun/2012:19:05:12 +0200] "GET /
robots.txt HTTP/1.0" 404 492 "-" “"Mozilla/5.0"

23. #!/bin/bash
[~/Apache]$ head -n 1 access.log
1.202.218.8 - - [20/Jun/2012:19:05:12 +0200] "GET /
robots.txt HTTP/1.0" 404 492 "-" “"Mozilla/5.0"
[~/Apache]$ head -n 1 access.log | awk '{print $1}'
1.202.218.8

24. #!/bin/bash
[~/Apache]$ head -n 1 access.log
1.202.218.8 - - [20/Jun/2012:19:05:12 +0200] "GET /
robots.txt HTTP/1.0" 404 492 "-" “"Mozilla/5.0"
[~/Apache]$ head -n 1 access.log | awk '{print $1}'
1.202.218.8
[~/Apache]$ awk '/access.log/' access.log | awk '{print
$1}'
31.184.238.164
31.184.238.164
77.27.18.67
31.184.238.164
31.184.238.164
31.184.238.164
31.184.238.164
31.184.238.164

25. #!/bin/bash
[~/Apache] $ awk '/access.log/' access.log |
awk '{print $1}' |
sort |
uniq -c |
sort -r

26. #!/bin/bash
[~/Apache] $ awk '/access.log/' access.log |
awk '{print $1}' |
sort |
uniq -c |
sort -r
41 31.184.238.164
2 192.210.213.91
1 77.27.18.67
1 192.227.243.66
1 189.120.185.4

27. B R O W S E R U S E D
IE
1%
Chrome
39%
Firefox
60%

28. G I T

29. G I T T O W E R

30. M E U R E P O S I T Ó R I O

31. B R A N C H E S

32. L O G

33. C O M M I T

34. H A H A H A

35. [~/symfony] $ git branch
* 2.7

36. [~/symfony] $ git branch
* 2.7
[~/symfony] $ git log | wc -l
299 348

37. [~/symfony] $ git branch
* 2.7
[~/symfony] $ git log | wc -l
299 348
[~/symfony] $ alias rank="sort | uniq -c | sort -nr | head -n 3“

38. [~/symfony] $ git branch
* 2.7
[~/symfony] $ git log | wc -l
299 348
[~/symfony] $ alias rank="sort | uniq -c | sort -nr | head -n 3“

39. [~/symfony] $ git branch
* 2.7
[~/symfony] $ git log | wc -l
299 348
[~/symfony] $ alias rank="sort | uniq -c | sort -nr | head -n 3“

40. [~/symfony] $ git branch
* 2.7
[~/symfony] $ git log | wc -l
299 348
[~/symfony] $ alias rank="sort | uniq -c | sort -nr | head -n 3“

41. [~/symfony] $ git branch
* 2.7
[~/symfony] $ git log | wc -l
299 348
[~/symfony] $ alias rank="sort | uniq -c | sort -nr | head -n 3“

42. [~/symfony] $ git branch
* 2.7
[~/symfony] $ git log | wc -l
299 348
[~/symfony] $ alias rank="sort | uniq -c | sort -nr | head -n 3“
[~/symfony] $ git log --format=%an | rank
10725 Fabien Potencier
1211 Bernhard Schussek
371 Tobias Schultze

43. [~/symfony] $ git config alias.author "log --format=%an"

44. [~/symfony] $ git config alias.author "log --format=%an"
[~/symfony] $ git author —since 2014-01-01 | rank
2444 Fabien Potencier
357 Nicolas Grekas
262 Bernhard Schussek

47. [~/symfony] $ cd ../zf2

48. [~/symfony] $ cd ../zf2
[~/zf2] $

49. [~/symfony] $ cd ../zf2
[~/zf2] $ git author | rank
7963 Matthew Weier O'Phinney
1647 Marco Pivetta
782 Maks3w

51. [~/zf2] $ git author --since 2014-01-01 | rank
1507 Marco Pivetta
1048 Matthew Weier O'Phinney
215 Abdul Malik Ikhsan

52. 1 #!/usr/bin/env php
2 <?php
3 /**
4 * hdate (Human Date)
5 *
6 * Converts a human (relative) date to an specific date.
7 * Usage: hdate "+10 day"
11 */
12
13 $relativeDate = $argv[1];
14 $date = new DateTime($relativeDate);
15
16 echo $date->format('Y-m-d');

53. [~/zf2] $ git author --since `hdate -1year` | rank
1358 Marco Pivetta
564 Matthew Weier O'Phinney
132 Abdul Malik Ikhsan

54. E D I T O R

55. V O LTA N D O A O
T R A B A L H O

56. [~/zf2] $ git diff --name-only HEAD^
library/Zend/Db/Sql/AbstractSql.php
tests/ZendTest/Db/Sql/AbstractSqlTest.php
tests/ZendTest/Db/Sql/ExpressionTest.php

57. [~/zf2] $ git diff --name-only HEAD^
library/Zend/Db/Sql/AbstractSql.php
tests/ZendTest/Db/Sql/AbstractSqlTest.php
tests/ZendTest/Db/Sql/ExpressionTest.php
[~/zf2] $ vim `git diff --name-only HEAD^`

58. L I N T ?

59. < E S C > : ! P H P - L %

60. < E S C > : ! P H P - L %
N O R M A L M O D E

61. < E S C > : ! P H P - L %
C O M A N D O E X T E R N O

62. < E S C > : ! P H P - L %
O P Ç Ã O “ L I N T ” D O P H P

63. < E S C > : ! P H P - L %
C A M I N H O C O M P L E T O D O A R Q U I V O A T U A L

64. R O D A R U M T E S T E ?

65. C H E C A R E S T I L O ?

66. V E R Ú LT I M O S A U T O R E S ?

67. A D I C I O N A R N O G I T ?

68. T U D O I S S O C O M A L G U N S
P O U C O S P R I N C Í P I O S D E D E S I G N

69. P R I N C Í P I O S
• Tudo é um arquivo
• Tipo de Informação? Texto.
• Escopos diferentes? Quebra de linha.
• Cache? Nah.
• Erros? Yeah!

70. L I M I T E S S Ã O B O N S ?
C O N C L U S Ã O
Cartier Bresson

71. P E R G U N TA S ?
W Eugene Smith

72. H T T P : / / B I T. LY / G U G U - L I N D O
F O I B O M P R A V O C Ê ?