Today I Learned

We constantly learn new things. This is a repo to share those learnings. TILs are short Markdown documents (a few sentences + example code) explaining concepts, bits of syntax, commands, or tips we've recently learned.

Today-I-Learned (TIL) is inspired by Thoughbot, TIL is a repository for everyone to share what we have learn today.

This repo has a tool that help you to manage and write down what you learned in scientific way.

What I learned

Table of Contents	👇
🆕 Top 5 recent learning
Becareful on using port mapping of Docker in Development [docker]	2022-03-17
Using extra hosts to add custom ip of hostnames to Docker container [docker]	2022-03-16
Laravel run scheduled command within parent environment [php]	2022-03-15
Minimize Google PHP SDK before deploying on production [php]	2022-03-14
Getting back Whoops error pages in Laravel 9 [php]	2022-03-13
📚 ansible [ 1 articles ]
1. Run shell command in all hosts	2019-02-18
📚 bash [ 4 articles ]
2. Simple HTTP server function helper	2017-10-05
3. Internal Variables in BASH	2018-08-06
4. Curl extract info from verbose mode	2018-08-07
5. Telnet server through SSL or TLS	2018-11-13
📚 chrome-dev [ 1 articles ]
6. Debugging Chrome extension	2015-11-30
📚 crypto [ 1 articles ]
7. Encrypt and decrypt file using openssl command line	2018-05-17
📚 css [ 1 articles ]
8. [Bug] Input lost focus after typing 1 character in Safari Browser	2018-11-01
📚 database [ 4 articles ]
9. Basics about sqlite command line tool	2017-04-25
10. Indexes on multiple columns	2017-10-13
11. Use temporarily data from another database in SQLite	2018-05-02
12. SQL Wildcard Characters	2018-07-26
📚 devops [ 5 articles ]
13. Checking forced push conflicts on source code in auto testing	2017-05-19
14. Free sandbox server for development	2017-08-04
15. Using netcat to wait a TCP service	2017-10-13
16. Ansible running host pattern	2018-01-22
17. Improve apt package manager speed by changing source list mirrors	2019-04-03
📚 docker [ 9 articles ]
18. Reducing docker image the right way	2017-05-24
19. Changing channel from alpha to stable will remove ALL DATA	2017-05-24
20. Reduce init time MySQL docker image	2017-11-22
21. Build lightweight image by using multistage	2018-02-23
22. SSH to docker host in Docker for Mac	2018-12-03
23. Can not run downloaded binary inside alpine linux because of missing shared libs	2019-02-02
24. Run container processes as non-root user	2019-03-30
25. Using extra hosts to add custom ip of hostnames to Docker container	2022-03-16
26. Becareful on using port mapping of Docker in Development	2022-03-17
📚 elasticsearch [ 1 articles ]
27. Basics of Elasticsearch	2018-01-25
📚 git [ 5 articles ]
28. Resolving conflict like a boss	2017-06-13
29. using git hooks to improve working flow	2017-11-22
30. Fastly conflict detector script	2017-11-27
31. Put .git data outside project directory	2018-05-29
32. Running git command using another ssh key	2018-06-26
📚 google-sheet [ 1 articles ]
33. Insert fastly current date time to cell in Google Spreadsheets	2021-03-09
📚 hostingpanel [ 1 articles ]
34. DirectAdmin change document root to public directory	2022-03-09
📚 http [ 3 articles ]
35. ab failed responses	2017-04-21
36. Create cross-platform downloading app URL	2018-01-03
37. Reuse cookies between multi requests in Curl tool	2018-05-22
📚 ios [ 2 articles ]
38. Flush DNS cache on iOS device	2018-03-14
39. Install CA root certificate on iOS device	2018-03-14
📚 java [ 1 articles ]
40. Runing old java applets on brower	2017-08-06
📚 javascript [ 11 articles ]
41. Scope and Closure	2017-08-10
42. Eval function and with block	2017-08-10
43. Debug js code using console.trace	2018-01-07
44. Define property of an object in hacking way	2018-01-07
45. Tracking changes of cookie on webpage	2018-01-10
46. Trigger event after setting val in jQuery	2018-01-14
47. Detect HTTP Response 304 Status Code in AJAX	2018-10-25
48. View all parameters passed to callback function without reading docs	2018-10-30
49. View function source in developer tool console	2018-11-21
50. Critical notice of string DOM manipulation using jQuery	2019-01-10
51. JSON Parse is faster than Javascript Object declaration	2019-11-23
📚 linux [ 5 articles ]
52. Remap Capslock to Control key	2017-08-08
53. Send ENTER key to kernel	2017-09-27
54. Using watch command to tracking changes in period time	2017-10-20
55. Disable IPv6 to stop getting stuck in network	2018-01-16
56. Make cron job runs every seconds	2018-11-15
📚 mac-osx [ 1 articles ]
57. Shortcut keyboard improve productivity	2015-11-30
📚 mysql [ 8 articles ]
58. Index is useless when use function on indexed field	2015-12-01
59. String problems can cause logical bugs in application	2017-02-17
60. UNION vs UNION ALL	2017-02-23
61. Mysql dumping only table structure	2017-05-17
62. Mycli : a new good cli MySql Client	2017-09-01
63. Sleeping connections in MySQL	2018-01-04
64. The safest way to reset root password of MySQL Server	2018-08-25
65. Export MySQL data by specified query to CSV file	2019-03-12
📚 nature [ 1 articles ]
66. Tại sao biển xanh lại mặn ? :lol:	2018-01-14
📚 networking [ 6 articles ]
67. TCP FIN timeout	2017-09-07
68. How SMTP works	2017-10-04
69. Set up simple rate limiting on specified port using UFW	2018-01-16
70. List opening ports or listening UNIX sockets	2018-02-21
71. Setup wildcard domains .test for development in MacOS	2018-04-24
72. Use NGINX as a TCP,UDP load balancer	2019-04-03
📚 php [ 11 articles ]
73. Eloquent Many-to-Many Relationship	2015-12-02
74. Run built-in server via Docker	2015-12-04
75. F-cking stupid limit of input vars	2016-03-08
76. Using VarDumper in PHPUnit	2017-02-23
77. Persistent connection to MySQL	2017-02-28
78. realpath function	2017-08-06
79. try, catch and finally in PHP	2018-05-04
80. Never autostart XDebug in cli environment	2018-05-07
81. Getting back Whoops error pages in Laravel 9	2022-03-13
82. Minimize Google PHP SDK before deploying on production	2022-03-14
83. Laravel run scheduled command within parent environment	2022-03-15
📚 programming [ 1 articles ]
84. Get random number from computer	2018-05-14
📚 python [ 7 articles ]
85. String Format Unicode params	2015-12-01
86. Reference assign object variable	2015-12-04
87. HTTP2 supported for python requests library	2017-08-04
88. Exporting environment variables on virtual env activate	2018-04-30
89. Do not use mutable objects as default parameters	2018-07-24
90. Context Managers in Python	2018-07-24
91. Setter and getter behavior of class property in Python3	2018-07-30
📚 quote [ 1 articles ]
92. Random quote 23 Feb 2017	2017-02-23
📚 redis [ 1 articles ]
93. Transaction style in Redis	2018-01-31
📚 sysadmin [ 34 articles ]
94. FTP via curl tool	2015-12-03
95. View real-time logs using websocketd	2015-12-04
96. Commands	2015-12-30
97. Stats your top-10 frequently commands	2016-03-26
98. Bash shell shortcuts	2016-03-26
99. Compressing and Extracting files with rar in Linux	2017-05-17
100. Grant user to use sudo without password	2017-05-18
101. wget Output flag	2017-05-19
102. Using BSD find util to find and exec command on file and folder	2017-05-22
103. zcat : decompressing pipe tool	2017-05-22
104. Gearman bash worker and client	2017-06-15
105. Cleaning up old linux kernels	2017-08-06
106. Create SSH tunnel manually	2017-09-01
107. Enable reverse proxy in CentOS	2017-09-01
108. Grep : find a string in folder	2017-09-05
109. Ansible playbook : skip to task	2017-09-05
110. Lock and unlock a user password	2017-09-07
111. Generate dhparam file faster	2017-09-07
112. Blocking specified country to prevent from DDOS	2017-09-25
113. BASH return a value in function	2017-09-26
114. BASH exiting on first error	2017-09-26
115. BASH tracing commands	2017-09-27
116. TIME command output meaning	2017-10-04
117. Using netcat as tiny TCP debug tool	2017-10-07
118. Getting your external IP	2017-11-24
119. Use journalctl to check system logs	2018-01-22
120. Prevent source hacking from .git directory exposing	2018-03-01
121. Cut file content from line to line	2018-03-25
122. Prepend line number to file	2018-03-25
123. Create a sequence of numbers	2018-03-25
124. Create tiny chat channel via netcat	2018-04-10
125. Send a file through networking via netcat	2018-04-10
126. View DNS history of a domain	2018-05-08
127. Curl override Name Resolution with specific IP address	2018-08-18
📚 tools [ 2 articles ]
128. Base 64 encode and decode builtin tool	2017-04-21
129. Zip compressing list of files	2017-09-25
📚 varnish [ 1 articles ]
130. Check vcl file syntax before restarting	2018-01-31
📚 vim [ 2 articles ]
131. Using mark to bookmark checkpoints in files	2018-01-30
132. Convert tabs to spaces	2018-02-21
📚 web [ 7 articles ]
133. Cloudflare Error 522 Connection Time out	2017-05-18
134. Ping Google to crawl updated content	2017-08-08
135. Using web proxy to bypass firewalls	2017-12-07
136. HSTS rule in browser	2018-01-03
137. Bypass CORS by using JSONP callback	2018-01-08
138. Sending Cookie in AJAX CORs request	2018-03-01
139. Can not get real IP address from Load Balancer SSL Passthrough	2019-03-14

Instruction

Step 1: Fork this repo (blank-repo with only tool and readme file).
Step 2: Start writting down what you learned in everyday.
- Create a topic by:
```
./til <CATEGORY> <SUBJECT> [EDITOR]
```
  - Ex:
```
./til bash "Bash Conditional Expression" vim
```
  - If you tired of typing the quote mark:
```
./til bash Bash-Conditional-Expression
./til bash Bash=Conditional=Expression
```
  DO NOT mix the - and = together!
- It will create 1 file whose name which is the SUBJECT in lower case: bash/160510-bash-conditional-expression.md.
- Write it! Save it!
Step 3: Commit what you learned today by ./til commit. After that, if you want to push it to repository, just Enter

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