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
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
Detect ViteHMR dev server is running [js]	2024-08-04
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
📚 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 [ 1 articles ]
9. Encrypt and decrypt file using openssl command line	2018-05-17
📚 css [ 2 articles ]
10. [Bug] Input lost focus after typing 1 character in Safari Browser	2018-11-01
11. CSS Selector element has an attribute which contains some string	2023-08-21
📚 database [ 4 articles ]
12. Basics about sqlite command line tool	2017-04-25
13. Indexes on multiple columns	2017-10-13
14. Use temporarily data from another database in SQLite	2018-05-02
15. SQL Wildcard Characters	2018-07-26
📚 devops [ 6 articles ]
16. Checking forced push conflicts on source code in auto testing	2017-05-19
17. Free sandbox server for development	2017-08-04
18. Using netcat to wait a TCP service	2017-10-13
19. Ansible running host pattern	2018-01-22
20. Improve apt package manager speed by changing source list mirrors	2019-04-03
21. Cronjob monitoring web endpoint and alert to Telegram	2024-04-12
📚 docker [ 9 articles ]
22. Changing channel from alpha to stable will remove ALL DATA	2017-05-24
23. Reducing docker image the right way	2017-05-24
24. Reduce init time MySQL docker image	2017-11-22
25. Build lightweight image by using multistage	2018-02-23
26. SSH to docker host in Docker for Mac	2018-12-03
27. Can not run downloaded binary inside alpine linux because of missing shared libs	2019-02-02
28. Run container processes as non-root user	2019-03-30
29. Using extra hosts to add custom ip of hostnames to Docker container	2022-03-16
30. Becareful on using port mapping of Docker in Development	2022-03-17
📚 elasticsearch [ 1 articles ]
31. Basics of Elasticsearch	2018-01-25
📚 git [ 5 articles ]
32. Resolving conflict like a boss	2017-06-13
33. using git hooks to improve working flow	2017-11-22
34. Fastly conflict detector script	2017-11-27
35. Put .git data outside project directory	2018-05-29
36. Running git command using another ssh key	2018-06-26
📚 google-sheet [ 1 articles ]
37. Insert fastly current date time to cell in Google Spreadsheets	2021-03-09
📚 hostingpanel [ 1 articles ]
38. DirectAdmin change document root to public directory	2022-03-09
📚 http [ 4 articles ]
39. ab failed responses	2017-04-21
40. Create cross-platform downloading app URL	2018-01-03
41. Reuse cookies between multi requests in Curl tool	2018-05-22
42. HTTP Status Codes : 301+302 vs 307+308	2023-08-20
📚 ios [ 2 articles ]
43. Flush DNS cache on iOS device	2018-03-14
44. Install CA root certificate on iOS device	2018-03-14
📚 java [ 1 articles ]
45. Runing old java applets on brower	2017-08-06
📚 javascript [ 12 articles ]
46. Eval function and with block	2017-08-10
47. Scope and Closure	2017-08-10
48. Debug js code using console.trace	2018-01-07
49. Define property of an object in hacking way	2018-01-07
50. Tracking changes of cookie on webpage	2018-01-10
51. Trigger event after setting val in jQuery	2018-01-14
52. Detect HTTP Response 304 Status Code in AJAX	2018-10-25
53. View all parameters passed to callback function without reading docs	2018-10-30
54. View function source in developer tool console	2018-11-21
55. Critical notice of string DOM manipulation using jQuery	2019-01-10
56. JSON Parse is faster than Javascript Object declaration	2019-11-23
57. Script tags in remote HTML request won't run when using innerHTML	2024-05-06
📚 js [ 5 articles ]
58. Array group by function in JS	2023-08-25
59. ES6 Module import in client browsers	2023-08-29
60. JS DOM event deepdive using SvelteJS demo	2023-09-01
61. Be careful when using built-in btoa from window to decode base64	2023-11-29
62. Detect ViteHMR dev server is running	2024-08-04
📚 laravel [ 2 articles ]
63. Split a Collection items into 2 groups using 1 boolean function	2023-11-25
64. Generate routing stubs for IDEs	2024-02-24
📚 linux [ 5 articles ]
65. Remap Capslock to Control key	2017-08-08
66. Send ENTER key to kernel	2017-09-27
67. Using watch command to tracking changes in period time	2017-10-20
68. Disable IPv6 to stop getting stuck in network	2018-01-16
69. Make cron job runs every seconds	2018-11-15
📚 mac-osx [ 2 articles ]
70. Shortcut keyboard improve productivity	2015-11-30
71. Warning on MacOS upgrade major system	2023-10-13
📚 mysql [ 8 articles ]
72. Index is useless when use function on indexed field	2015-12-01
73. String problems can cause logical bugs in application	2017-02-17
74. UNION vs UNION ALL	2017-02-23
75. Mysql dumping only table structure	2017-05-17
76. Mycli : a new good cli MySql Client	2017-09-01
77. Sleeping connections in MySQL	2018-01-04
78. The safest way to reset root password of MySQL Server	2018-08-25
79. Export MySQL data by specified query to CSV file	2019-03-12
📚 nature [ 1 articles ]
80. Tại sao biển xanh lại mặn ? :lol:	2018-01-14
📚 networking [ 6 articles ]
81. TCP FIN timeout	2017-09-07
82. How SMTP works	2017-10-04
83. Set up simple rate limiting on specified port using UFW	2018-01-16
84. List opening ports or listening UNIX sockets	2018-02-21
85. Setup wildcard domains .test for development in MacOS	2018-04-24
86. Use NGINX as a TCP,UDP load balancer	2019-04-03
📚 php [ 14 articles ]
87. Eloquent Many-to-Many Relationship	2015-12-02
88. Run built-in server via Docker	2015-12-04
89. F-cking stupid limit of input vars	2016-03-08
90. Using VarDumper in PHPUnit	2017-02-23
91. Persistent connection to MySQL	2017-02-28
92. realpath function	2017-08-06
93. try, catch and finally in PHP	2018-05-04
94. Never autostart XDebug in cli environment	2018-05-07
95. Getting back Whoops error pages in Laravel 9	2022-03-13
96. Minimize Google PHP SDK before deploying on production	2022-03-14
97. Laravel run scheduled command within parent environment	2022-03-15
98. Cache storage utils using redis server	2023-10-08
99. Transform array to object shorthand	2023-12-08
100. PHP memory allocation when passing arguments into function	2024-08-06
📚 programming [ 1 articles ]
101. Get random number from computer	2018-05-14
📚 python [ 7 articles ]
102. String Format Unicode params	2015-12-01
103. Reference assign object variable	2015-12-04
104. HTTP2 supported for python requests library	2017-08-04
105. Exporting environment variables on virtual env activate	2018-04-30
106. Do not use mutable objects as default parameters	2018-07-24
107. Context Managers in Python	2018-07-24
108. Setter and getter behavior of class property in Python3	2018-07-30
📚 quote [ 1 articles ]
109. Random quote 23 Feb 2017	2017-02-23
📚 redis [ 1 articles ]
110. Transaction style in Redis	2018-01-31
📚 svelte [ 2 articles ]
111. SvelteJS : Reactivity via variable assignment	2023-08-28
112. Reactive statement explicit dependencies like React useEffect	2023-11-12
📚 swift [ 1 articles ]
113. XCode automatic format code on build time	2024-02-28
📚 sysadmin [ 34 articles ]
114. FTP via curl tool	2015-12-03
115. View real-time logs using websocketd	2015-12-04
116. Commands	2015-12-30
117. Bash shell shortcuts	2016-03-26
118. Stats your top-10 frequently commands	2016-03-26
119. Compressing and Extracting files with rar in Linux	2017-05-17
120. Grant user to use sudo without password	2017-05-18
121. wget Output flag	2017-05-19
122. Using BSD find util to find and exec command on file and folder	2017-05-22
123. zcat : decompressing pipe tool	2017-05-22
124. Gearman bash worker and client	2017-06-15
125. Cleaning up old linux kernels	2017-08-06
126. Create SSH tunnel manually	2017-09-01
127. Enable reverse proxy in CentOS	2017-09-01
128. Ansible playbook : skip to task	2017-09-05
129. Grep : find a string in folder	2017-09-05
130. Lock and unlock a user password	2017-09-07
131. Generate dhparam file faster	2017-09-07
132. Blocking specified country to prevent from DDOS	2017-09-25
133. BASH exiting on first error	2017-09-26
134. BASH return a value in function	2017-09-26
135. BASH tracing commands	2017-09-27
136. TIME command output meaning	2017-10-04
137. Using netcat as tiny TCP debug tool	2017-10-07
138. Getting your external IP	2017-11-24
139. Use journalctl to check system logs	2018-01-22
140. Prevent source hacking from .git directory exposing	2018-03-01
141. Cut file content from line to line	2018-03-25
142. Prepend line number to file	2018-03-25
143. Create a sequence of numbers	2018-03-25
144. Send a file through networking via netcat	2018-04-10
145. Create tiny chat channel via netcat	2018-04-10
146. View DNS history of a domain	2018-05-08
147. Curl override Name Resolution with specific IP address	2018-08-18
📚 tools [ 2 articles ]
148. Base 64 encode and decode builtin tool	2017-04-21
149. Zip compressing list of files	2017-09-25
📚 varnish [ 1 articles ]
150. Check vcl file syntax before restarting	2018-01-31
📚 vim [ 2 articles ]
151. Using mark to bookmark checkpoints in files	2018-01-30
152. Convert tabs to spaces	2018-02-21
📚 web [ 8 articles ]
153. Cloudflare Error 522 Connection Time out	2017-05-18
154. Ping Google to crawl updated content	2017-08-08
155. Using web proxy to bypass firewalls	2017-12-07
156. HSTS rule in browser	2018-01-03
157. Bypass CORS by using JSONP callback	2018-01-08
158. Sending Cookie in AJAX CORs request	2018-03-01
159. Can not get real IP address from Load Balancer SSL Passthrough	2019-03-14
160. 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.