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
Storing master key inside MacOS keychain [crypto]	2024-10-14
Run multiple AlpineJS inits and effects on same element [javascript]	2024-09-30
HTML Form no trigger submit when press Enter key on input [web]	2024-09-19
Using Curl to check downtime and ssl cert expiration [bash]	2024-08-10
PHP memory allocation when passing arguments into function [php]	2024-08-06
📚 ansible [ 1 articles ]
1. Run shell command in all hosts	2019-02-18
📚 apps-script [ 1 articles ]
2. Getting database from data range to array of enum objects	2023-09-03
📚 bash [ 5 articles ]
3. Simple HTTP server function helper	2017-10-05
4. Internal Variables in BASH	2018-08-06
5. Curl extract info from verbose mode	2018-08-07
6. Telnet server through SSL or TLS	2018-11-13
7. Using Curl to check downtime and ssl cert expiration	2024-08-10
📚 chrome-dev [ 1 articles ]
8. Debugging Chrome extension	2015-11-30
📚 crypto [ 2 articles ]
9. Encrypt and decrypt file using openssl command line	2018-05-17
10. Storing master key inside MacOS keychain	2024-10-14
📚 css [ 2 articles ]
11. [Bug] Input lost focus after typing 1 character in Safari Browser	2018-11-01
12. CSS Selector element has an attribute which contains some string	2023-08-21
📚 database [ 4 articles ]
13. Basics about sqlite command line tool	2017-04-25
14. Indexes on multiple columns	2017-10-13
15. Use temporarily data from another database in SQLite	2018-05-02
16. SQL Wildcard Characters	2018-07-26
📚 devops [ 6 articles ]
17. Checking forced push conflicts on source code in auto testing	2017-05-19
18. Free sandbox server for development	2017-08-04
19. Using netcat to wait a TCP service	2017-10-13
20. Ansible running host pattern	2018-01-22
21. Improve apt package manager speed by changing source list mirrors	2019-04-03
22. Cronjob monitoring web endpoint and alert to Telegram	2024-04-12
📚 docker [ 9 articles ]
23. Changing channel from alpha to stable will remove ALL DATA	2017-05-24
24. Reducing docker image the right way	2017-05-24
25. Reduce init time MySQL docker image	2017-11-22
26. Build lightweight image by using multistage	2018-02-23
27. SSH to docker host in Docker for Mac	2018-12-03
28. Can not run downloaded binary inside alpine linux because of missing shared libs	2019-02-02
29. Run container processes as non-root user	2019-03-30
30. Using extra hosts to add custom ip of hostnames to Docker container	2022-03-16
31. Becareful on using port mapping of Docker in Development	2022-03-17
📚 elasticsearch [ 1 articles ]
32. Basics of Elasticsearch	2018-01-25
📚 git [ 5 articles ]
33. Resolving conflict like a boss	2017-06-13
34. using git hooks to improve working flow	2017-11-22
35. Fastly conflict detector script	2017-11-27
36. Put .git data outside project directory	2018-05-29
37. Running git command using another ssh key	2018-06-26
📚 google-sheet [ 1 articles ]
38. Insert fastly current date time to cell in Google Spreadsheets	2021-03-09
📚 hostingpanel [ 1 articles ]
39. DirectAdmin change document root to public directory	2022-03-09
📚 http [ 4 articles ]
40. ab failed responses	2017-04-21
41. Create cross-platform downloading app URL	2018-01-03
42. Reuse cookies between multi requests in Curl tool	2018-05-22
43. HTTP Status Codes : 301+302 vs 307+308	2023-08-20
📚 ios [ 2 articles ]
44. Flush DNS cache on iOS device	2018-03-14
45. Install CA root certificate on iOS device	2018-03-14
📚 java [ 1 articles ]
46. Runing old java applets on brower	2017-08-06
📚 javascript [ 13 articles ]
47. Eval function and with block	2017-08-10
48. Scope and Closure	2017-08-10
49. Debug js code using console.trace	2018-01-07
50. Define property of an object in hacking way	2018-01-07
51. Tracking changes of cookie on webpage	2018-01-10
52. Trigger event after setting val in jQuery	2018-01-14
53. Detect HTTP Response 304 Status Code in AJAX	2018-10-25
54. View all parameters passed to callback function without reading docs	2018-10-30
55. View function source in developer tool console	2018-11-21
56. Critical notice of string DOM manipulation using jQuery	2019-01-10
57. JSON Parse is faster than Javascript Object declaration	2019-11-23
58. Script tags in remote HTML request won't run when using innerHTML	2024-05-06
59. Run multiple AlpineJS inits and effects on same element	2024-09-30
📚 js [ 5 articles ]
60. Array group by function in JS	2023-08-25
61. ES6 Module import in client browsers	2023-08-29
62. JS DOM event deepdive using SvelteJS demo	2023-09-01
63. Be careful when using built-in btoa from window to decode base64	2023-11-29
64. Detect ViteHMR dev server is running	2024-08-04
📚 laravel [ 2 articles ]
65. Split a Collection items into 2 groups using 1 boolean function	2023-11-25
66. Generate routing stubs for IDEs	2024-02-24
📚 linux [ 5 articles ]
67. Remap Capslock to Control key	2017-08-08
68. Send ENTER key to kernel	2017-09-27
69. Using watch command to tracking changes in period time	2017-10-20
70. Disable IPv6 to stop getting stuck in network	2018-01-16
71. Make cron job runs every seconds	2018-11-15
📚 mac-osx [ 2 articles ]
72. Shortcut keyboard improve productivity	2015-11-30
73. Warning on MacOS upgrade major system	2023-10-13
📚 mysql [ 8 articles ]
74. Index is useless when use function on indexed field	2015-12-01
75. String problems can cause logical bugs in application	2017-02-17
76. UNION vs UNION ALL	2017-02-23
77. Mysql dumping only table structure	2017-05-17
78. Mycli : a new good cli MySql Client	2017-09-01
79. Sleeping connections in MySQL	2018-01-04
80. The safest way to reset root password of MySQL Server	2018-08-25
81. Export MySQL data by specified query to CSV file	2019-03-12
📚 nature [ 1 articles ]
82. Tại sao biển xanh lại mặn ? :lol:	2018-01-14
📚 networking [ 6 articles ]
83. TCP FIN timeout	2017-09-07
84. How SMTP works	2017-10-04
85. Set up simple rate limiting on specified port using UFW	2018-01-16
86. List opening ports or listening UNIX sockets	2018-02-21
87. Setup wildcard domains .test for development in MacOS	2018-04-24
88. Use NGINX as a TCP,UDP load balancer	2019-04-03
📚 php [ 14 articles ]
89. Eloquent Many-to-Many Relationship	2015-12-02
90. Run built-in server via Docker	2015-12-04
91. F-cking stupid limit of input vars	2016-03-08
92. Using VarDumper in PHPUnit	2017-02-23
93. Persistent connection to MySQL	2017-02-28
94. realpath function	2017-08-06
95. try, catch and finally in PHP	2018-05-04
96. Never autostart XDebug in cli environment	2018-05-07
97. Getting back Whoops error pages in Laravel 9	2022-03-13
98. Minimize Google PHP SDK before deploying on production	2022-03-14
99. Laravel run scheduled command within parent environment	2022-03-15
100. Cache storage utils using redis server	2023-10-08
101. Transform array to object shorthand	2023-12-08
102. PHP memory allocation when passing arguments into function	2024-08-06
📚 programming [ 1 articles ]
103. Get random number from computer	2018-05-14
📚 python [ 7 articles ]
104. String Format Unicode params	2015-12-01
105. Reference assign object variable	2015-12-04
106. HTTP2 supported for python requests library	2017-08-04
107. Exporting environment variables on virtual env activate	2018-04-30
108. Do not use mutable objects as default parameters	2018-07-24
109. Context Managers in Python	2018-07-24
110. Setter and getter behavior of class property in Python3	2018-07-30
📚 quote [ 1 articles ]
111. Random quote 23 Feb 2017	2017-02-23
📚 redis [ 1 articles ]
112. Transaction style in Redis	2018-01-31
📚 svelte [ 2 articles ]
113. SvelteJS : Reactivity via variable assignment	2023-08-28
114. Reactive statement explicit dependencies like React useEffect	2023-11-12
📚 swift [ 1 articles ]
115. XCode automatic format code on build time	2024-02-28
📚 sysadmin [ 34 articles ]
116. FTP via curl tool	2015-12-03
117. View real-time logs using websocketd	2015-12-04
118. Commands	2015-12-30
119. Bash shell shortcuts	2016-03-26
120. Stats your top-10 frequently commands	2016-03-26
121. Compressing and Extracting files with rar in Linux	2017-05-17
122. Grant user to use sudo without password	2017-05-18
123. wget Output flag	2017-05-19
124. Using BSD find util to find and exec command on file and folder	2017-05-22
125. zcat : decompressing pipe tool	2017-05-22
126. Gearman bash worker and client	2017-06-15
127. Cleaning up old linux kernels	2017-08-06
128. Create SSH tunnel manually	2017-09-01
129. Enable reverse proxy in CentOS	2017-09-01
130. Ansible playbook : skip to task	2017-09-05
131. Grep : find a string in folder	2017-09-05
132. Lock and unlock a user password	2017-09-07
133. Generate dhparam file faster	2017-09-07
134. Blocking specified country to prevent from DDOS	2017-09-25
135. BASH exiting on first error	2017-09-26
136. BASH return a value in function	2017-09-26
137. BASH tracing commands	2017-09-27
138. TIME command output meaning	2017-10-04
139. Using netcat as tiny TCP debug tool	2017-10-07
140. Getting your external IP	2017-11-24
141. Use journalctl to check system logs	2018-01-22
142. Prevent source hacking from .git directory exposing	2018-03-01
143. Cut file content from line to line	2018-03-25
144. Prepend line number to file	2018-03-25
145. Create a sequence of numbers	2018-03-25
146. Send a file through networking via netcat	2018-04-10
147. Create tiny chat channel via netcat	2018-04-10
148. View DNS history of a domain	2018-05-08
149. Curl override Name Resolution with specific IP address	2018-08-18
📚 tools [ 2 articles ]
150. Base 64 encode and decode builtin tool	2017-04-21
151. Zip compressing list of files	2017-09-25
📚 varnish [ 1 articles ]
152. Check vcl file syntax before restarting	2018-01-31
📚 vim [ 2 articles ]
153. Using mark to bookmark checkpoints in files	2018-01-30
154. Convert tabs to spaces	2018-02-21
📚 web [ 9 articles ]
155. Cloudflare Error 522 Connection Time out	2017-05-18
156. Ping Google to crawl updated content	2017-08-08
157. Using web proxy to bypass firewalls	2017-12-07
158. HSTS rule in browser	2018-01-03
159. Bypass CORS by using JSONP callback	2018-01-08
160. Sending Cookie in AJAX CORs request	2018-03-01
161. Can not get real IP address from Load Balancer SSL Passthrough	2019-03-14
162. Smallest inline dummy image in HTML	2024-01-15
163. HTML Form no trigger submit when press Enter key on input	2024-09-19

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

License

© 2018 khanhicetea. Distributed under the Creative Commons Attribution License.