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
Script tags in remote HTML request won't run when using innerHTML [javascript]	2024-05-06
Cronjob monitoring web endpoint and alert to Telegram [devops]	2024-04-12
XCode automatic format code on build time [swift]	2024-02-28
Generate routing stubs for IDEs [laravel]	2024-02-24
Smallest inline dummy image in HTML [web]	2024-01-15
📚 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 [ 4 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
📚 chrome-dev [ 1 articles ]
7. Debugging Chrome extension	2015-11-30
📚 crypto [ 1 articles ]
8. Encrypt and decrypt file using openssl command line	2018-05-17
📚 css [ 2 articles ]
9. [Bug] Input lost focus after typing 1 character in Safari Browser	2018-11-01
10. CSS Selector element has an attribute which contains some string	2023-08-21
📚 database [ 4 articles ]
11. Basics about sqlite command line tool	2017-04-25
12. Indexes on multiple columns	2017-10-13
13. Use temporarily data from another database in SQLite	2018-05-02
14. SQL Wildcard Characters	2018-07-26
📚 devops [ 6 articles ]
15. Checking forced push conflicts on source code in auto testing	2017-05-19
16. Free sandbox server for development	2017-08-04
17. Using netcat to wait a TCP service	2017-10-13
18. Ansible running host pattern	2018-01-22
19. Improve apt package manager speed by changing source list mirrors	2019-04-03
20. Cronjob monitoring web endpoint and alert to Telegram	2024-04-12
📚 docker [ 9 articles ]
21. Changing channel from alpha to stable will remove ALL DATA	2017-05-24
22. Reducing docker image the right way	2017-05-24
23. Reduce init time MySQL docker image	2017-11-22
24. Build lightweight image by using multistage	2018-02-23
25. SSH to docker host in Docker for Mac	2018-12-03
26. Can not run downloaded binary inside alpine linux because of missing shared libs	2019-02-02
27. Run container processes as non-root user	2019-03-30
28. Using extra hosts to add custom ip of hostnames to Docker container	2022-03-16
29. Becareful on using port mapping of Docker in Development	2022-03-17
📚 elasticsearch [ 1 articles ]
30. Basics of Elasticsearch	2018-01-25
📚 git [ 5 articles ]
31. Resolving conflict like a boss	2017-06-13
32. using git hooks to improve working flow	2017-11-22
33. Fastly conflict detector script	2017-11-27
34. Put .git data outside project directory	2018-05-29
35. Running git command using another ssh key	2018-06-26
📚 google-sheet [ 1 articles ]
36. Insert fastly current date time to cell in Google Spreadsheets	2021-03-09
📚 hostingpanel [ 1 articles ]
37. DirectAdmin change document root to public directory	2022-03-09
📚 http [ 4 articles ]
38. ab failed responses	2017-04-21
39. Create cross-platform downloading app URL	2018-01-03
40. Reuse cookies between multi requests in Curl tool	2018-05-22
41. HTTP Status Codes : 301+302 vs 307+308	2023-08-20
📚 ios [ 2 articles ]
42. Flush DNS cache on iOS device	2018-03-14
43. Install CA root certificate on iOS device	2018-03-14
📚 java [ 1 articles ]
44. Runing old java applets on brower	2017-08-06
📚 javascript [ 12 articles ]
45. Eval function and with block	2017-08-10
46. Scope and Closure	2017-08-10
47. Debug js code using console.trace	2018-01-07
48. Define property of an object in hacking way	2018-01-07
49. Tracking changes of cookie on webpage	2018-01-10
50. Trigger event after setting val in jQuery	2018-01-14
51. Detect HTTP Response 304 Status Code in AJAX	2018-10-25
52. View all parameters passed to callback function without reading docs	2018-10-30
53. View function source in developer tool console	2018-11-21
54. Critical notice of string DOM manipulation using jQuery	2019-01-10
55. JSON Parse is faster than Javascript Object declaration	2019-11-23
56. Script tags in remote HTML request won't run when using innerHTML	2024-05-06
📚 js [ 4 articles ]
57. Array group by function in JS	2023-08-25
58. ES6 Module import in client browsers	2023-08-29
59. JS DOM event deepdive using SvelteJS demo	2023-09-01
60. Be careful when using built-in btoa from window to decode base64	2023-11-29
📚 laravel [ 2 articles ]
61. Split a Collection items into 2 groups using 1 boolean function	2023-11-25
62. Generate routing stubs for IDEs	2024-02-24
📚 linux [ 5 articles ]
63. Remap Capslock to Control key	2017-08-08
64. Send ENTER key to kernel	2017-09-27
65. Using watch command to tracking changes in period time	2017-10-20
66. Disable IPv6 to stop getting stuck in network	2018-01-16
67. Make cron job runs every seconds	2018-11-15
📚 mac-osx [ 2 articles ]
68. Shortcut keyboard improve productivity	2015-11-30
69. Warning on MacOS upgrade major system	2023-10-13
📚 mysql [ 8 articles ]
70. Index is useless when use function on indexed field	2015-12-01
71. String problems can cause logical bugs in application	2017-02-17
72. UNION vs UNION ALL	2017-02-23
73. Mysql dumping only table structure	2017-05-17
74. Mycli : a new good cli MySql Client	2017-09-01
75. Sleeping connections in MySQL	2018-01-04
76. The safest way to reset root password of MySQL Server	2018-08-25
77. Export MySQL data by specified query to CSV file	2019-03-12
📚 nature [ 1 articles ]
78. Tại sao biển xanh lại mặn ? :lol:	2018-01-14
📚 networking [ 6 articles ]
79. TCP FIN timeout	2017-09-07
80. How SMTP works	2017-10-04
81. Set up simple rate limiting on specified port using UFW	2018-01-16
82. List opening ports or listening UNIX sockets	2018-02-21
83. Setup wildcard domains .test for development in MacOS	2018-04-24
84. Use NGINX as a TCP,UDP load balancer	2019-04-03
📚 php [ 13 articles ]
85. Eloquent Many-to-Many Relationship	2015-12-02
86. Run built-in server via Docker	2015-12-04
87. F-cking stupid limit of input vars	2016-03-08
88. Using VarDumper in PHPUnit	2017-02-23
89. Persistent connection to MySQL	2017-02-28
90. realpath function	2017-08-06
91. try, catch and finally in PHP	2018-05-04
92. Never autostart XDebug in cli environment	2018-05-07
93. Getting back Whoops error pages in Laravel 9	2022-03-13
94. Minimize Google PHP SDK before deploying on production	2022-03-14
95. Laravel run scheduled command within parent environment	2022-03-15
96. Cache storage utils using redis server	2023-10-08
97. Transform array to object shorthand	2023-12-08
📚 programming [ 1 articles ]
98. Get random number from computer	2018-05-14
📚 python [ 7 articles ]
99. String Format Unicode params	2015-12-01
100. Reference assign object variable	2015-12-04
101. HTTP2 supported for python requests library	2017-08-04
102. Exporting environment variables on virtual env activate	2018-04-30
103. Do not use mutable objects as default parameters	2018-07-24
104. Context Managers in Python	2018-07-24
105. Setter and getter behavior of class property in Python3	2018-07-30
📚 quote [ 1 articles ]
106. Random quote 23 Feb 2017	2017-02-23
📚 redis [ 1 articles ]
107. Transaction style in Redis	2018-01-31
📚 svelte [ 2 articles ]
108. SvelteJS : Reactivity via variable assignment	2023-08-28
109. Reactive statement explicit dependencies like React useEffect	2023-11-12
📚 swift [ 1 articles ]
110. XCode automatic format code on build time	2024-02-28
📚 sysadmin [ 34 articles ]
111. FTP via curl tool	2015-12-03
112. View real-time logs using websocketd	2015-12-04
113. Commands	2015-12-30
114. Bash shell shortcuts	2016-03-26
115. Stats your top-10 frequently commands	2016-03-26
116. Compressing and Extracting files with rar in Linux	2017-05-17
117. Grant user to use sudo without password	2017-05-18
118. wget Output flag	2017-05-19
119. Using BSD find util to find and exec command on file and folder	2017-05-22
120. zcat : decompressing pipe tool	2017-05-22
121. Gearman bash worker and client	2017-06-15
122. Cleaning up old linux kernels	2017-08-06
123. Create SSH tunnel manually	2017-09-01
124. Enable reverse proxy in CentOS	2017-09-01
125. Ansible playbook : skip to task	2017-09-05
126. Grep : find a string in folder	2017-09-05
127. Lock and unlock a user password	2017-09-07
128. Generate dhparam file faster	2017-09-07
129. Blocking specified country to prevent from DDOS	2017-09-25
130. BASH exiting on first error	2017-09-26
131. BASH return a value in function	2017-09-26
132. BASH tracing commands	2017-09-27
133. TIME command output meaning	2017-10-04
134. Using netcat as tiny TCP debug tool	2017-10-07
135. Getting your external IP	2017-11-24
136. Use journalctl to check system logs	2018-01-22
137. Prevent source hacking from .git directory exposing	2018-03-01
138. Cut file content from line to line	2018-03-25
139. Prepend line number to file	2018-03-25
140. Create a sequence of numbers	2018-03-25
141. Send a file through networking via netcat	2018-04-10
142. Create tiny chat channel via netcat	2018-04-10
143. View DNS history of a domain	2018-05-08
144. Curl override Name Resolution with specific IP address	2018-08-18
📚 tools [ 2 articles ]
145. Base 64 encode and decode builtin tool	2017-04-21
146. Zip compressing list of files	2017-09-25
📚 varnish [ 1 articles ]
147. Check vcl file syntax before restarting	2018-01-31
📚 vim [ 2 articles ]
148. Using mark to bookmark checkpoints in files	2018-01-30
149. Convert tabs to spaces	2018-02-21
📚 web [ 8 articles ]
150. Cloudflare Error 522 Connection Time out	2017-05-18
151. Ping Google to crawl updated content	2017-08-08
152. Using web proxy to bypass firewalls	2017-12-07
153. HSTS rule in browser	2018-01-03
154. Bypass CORS by using JSONP callback	2018-01-08
155. Sending Cookie in AJAX CORs request	2018-03-01
156. Can not get real IP address from Load Balancer SSL Passthrough	2019-03-14
157. Smallest inline dummy image in HTML	2024-01-15

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.