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Manage "apt" Package Repositories
This section provides a quick introduction on 'apt' package repositories, which are defined in the /etc/apt/sources.list file.
2025-12-29, ∼113🔥, 0💬

Layers of Memory and Access Speed
This section describes layers of memory: CPU Register, CPU Caches, RAM and hard disk.
2025-12-29, ∼112🔥, 0💬

smem - Process Memory Usage Report
This section provides a tutorial on how to install 'smem' and use it to report memory usage of each running process.
2025-12-29, ∼112🔥, 0💬

"find" - Search for Files
This section provides a tutorial example on how to use 'find' command to search for files in a directory tree. '-name' and '-size' are 2 commonly used search conditions.
2025-12-29, ∼112🔥, 0💬

List CPU Caches and Their Sizes
This section describes how to use 'lscpu', 'lshw' and 'dmidecode' commands to list CPU caches and their sizes.
2025-12-29, ∼111🔥, 0💬

"shutdown" and "halt/poweroff/reboot" Commands
This section provides a quick introduction of the 'shutdown' command, and its alias commands 'halt', 'poweroff', and 'reboot'.
2025-12-29, ∼111🔥, 0💬

/proc/{id}/smaps - Process Memory Map Details
This section describes the pseudo file '/proc/{id}/smaps' that represents virtual memory map of a given process with detailed information on each mapped area.
2025-12-29, ∼110🔥, 0💬

What Is Shell
This section provides a quick introduction of shell programs on Ubuntu computer. Bash (Bourne Again SHell) is the default shell program.
2025-12-29, ∼108🔥, 0💬

Buffer Memory and Cache Memory
This section describes buffer memory and cache memory, which are temporary memory allocations in the free RAM area to improve data input and output performance on hard disk.
2025-12-29, ∼108🔥, 0💬

"tar -c" and "tar -x" - Create and Extract Archive Files
This section provides a tutorial example on how to use 'tar -c' command to compress multiple file and sub-directories into an archive file and use 'tar -x' command to extract files out of an archive file.
2025-12-29, ∼108🔥, 0💬

1FA70: Symbols and Pictographs Extended-A
This section provides a quick summary of the Unicode code point block: 'Symbols and Pictographs Extended-A', which contains 144 code points to represent Symbols and Pictographs Extended-A alphabets used in the Symbols and Pictographs Extended-A language.
2025-12-28, ∼715🔥, 1💬

XML Tutorials - Herong's Tutorial Examples
This XML tutorial book is a collection of notes and sample codes written by the author while he was learning XML himself. Topics include introduction to XML, DTD (Document Type Definition), XSD (XML Schema Definition), XPath (XML Path Language), XSL (Extensible Stylesheet Language), XSLT (XSL Transf...
2025-12-23, ≈13🔥, 3💬

💬 2022-07-22 Helen: This is very helpful!

💬 2016-05-07 mehari: this tutorials helps many trainers through out the world, thanks!

💬 2015-07-19 Jay: What about JSON format?

Free Chinese Calendar 2001 - Year of the Snake
Want to know when is the 2001 Chinese New Year day? Look for free Chinese calendars for 2001? Chinese New Year Date for Year 2001   ⇒ Free Chinese Calendar 2002 - Year of the Horse ⇐ Free Chinese Calendars: 2001 - 2010 ⇑ Free Chinese Calendars: 2001 - 2010 ⇑⇑ Free Chinese Calendars
2025-12-19, ∼1119🔥, 0💬

Free Chinese Calendar 2002 - Year of the Horse
Want to know when is the 2002 Chinese New Year day? Look for free Chinese calendars for 2002? Chinese New Year Date for Year 2002   ⇒ Free Chinese Calendar 2003 - Year of the Goat ⇐ Free Chinese Calendar 2001 - Year of the Snake ⇑ Free Chinese Calendars: 2001 - 2010 ⇑⇑ Free Chinese Calendars
2025-12-19, ∼1098🔥, 0💬

1FB00: Symbols for Legacy Computing
This section provides a quick summary of the Unicode code point block: 'Symbols for Legacy Computing', which contains 256 code points to represent Symbols for Legacy Computing alphabets used in the Symbols for Legacy Computing language.
2025-12-18, ∼1876🔥, 5💬

💬 2025-12-18 Jayy Meyerholt: Symbols for Legacy Computing is still not a language.

💬 2025-09-02 PhilV: All codes points between U+1FB00 and U+1FBF9 have been allocated (up to Unicode 16.0 released in September 2024), and Unicode 17...

💬 2021-11-12 Herong: Graphical character code can be used to create text art, see https://textart.me: ╲╲╲╲╲┏━━━┓╱╱╱╱╱ ╲┏━━━┻━━━...

💬 2021-11-10 Edith Thorne: Yeah, it isn't defined; it's a reserved slot for a character that the original proposal couldn't actually find used in any legac...

💬 2021-07-05 Jayy Meyerholt: It could say "The "Symbols for Legacy Computing" block contains code points to represent various symbols from various retro enco...

Downloading and Installing JDK 1.8
This section describes how to download and install Java SE Development Kit (JDK) 8u45 on a Windows system.
2025-12-05, ≈36🔥, 15💬

💬 2025-12-05 Kirill: [eq

💬 2023-11-24 EIEI: Thanks! ☺

💬 2023-11-14 fsdfdsf: thanks

💬 2022-08-08 eni: thanks

💬 2020-04-27 ema: thanks

(More comments ...)

Lucky Wedding Dates: 2011 - Year of the Rabbit
Where to find lucky wedding dates for year 2011? Lucky Wedding Dates: 2011 - Year of the Rabbit   ⇒ Lucky Wedding Dates: 2012 - Year of the Dragon ⇐ Lucky Wedding Dates: 2011 - 2020 ⇑ Lucky Wedding Dates: 2011 - 2020 ⇑⇑ Wedding Date - The Most Important Date of Your Life
2025-12-01, ∼744🔥, 0💬

Lucky Wedding Dates: 2015 - Year of the Goat
Where to find lucky wedding dates for year 2015? Lucky Wedding Dates: 2015 - Year of the Goat   ⇒ Lucky Wedding Dates: 2016 - Year of the Monkey ⇐ Lucky Wedding Dates: 2014 - Year of the Horse ⇑ Lucky Wedding Dates: 2011 - 2020 ⇑⇑ Wedding Date - The Most Important Date of Your Life
2025-12-01, ∼736🔥, 0💬

Lucky Wedding Dates: 2040 - Year of the Monkey
Where to find lucky wedding dates for year 2040? Lucky Wedding Dates: 2040 - Year of the Monkey   ⇒ Lucky Wedding Dates: 2041 - 2050 ⇐ Lucky Wedding Dates: 2039 - Year of the Goat ⇑ Lucky Wedding Dates: 2031 - 2040 ⇑⇑ Wedding Date - The Most Important Date of Your Life
2025-12-01, ∼676🔥, 0💬

Sequence Diagram - Execution Specification Notation
This section describes the Execution Specification Notation used in a UML Sequence Diagram. An Execution Specification Notation presents the execution of action unit within a lifeline of an object.
2025-11-29, ∼254🔥, 1💬

XML Tools Plugin for Notepad++
This chapter provides notes and tutorial examples on XML Tools Plugin for Notepad++. Topics include downloading and installing Notepad++ and XML Tools Plugin; generating pretty print XML format; XSD validation; XSLT transformation.
2025-11-17, ≈172🔥, 70💬

💬 2025-11-17 Lazaros: Xml Tools Thanks

💬 2023-04-05 Marcin: great tool

💬 2022-12-03 Herong: Stuart, may be you need to set the output encoding as UTF-8: &lt;xsl:output encoding="UTF-8" ...>

💬 2022-12-01 Stuart: The XML tools are great. I've just tried the XSL Transformation too for an XML-HTML transformation containing Arabic characters ...

💬 2019-09-10 xiaolu: Great tool

(More comments ...)

Comments on Herong's Tutorial Books
Please share your general comments on my tutorial books here. Comments should not contain hyperlinks to any external Web sites.
2025-11-03, ≈122🔥, 246💬

💬 2022-12-19 James Fonteront: "Hello I have noticed that you have a few opportunities for guest posting. I'm interested in contributing paid content to your s...

💬 2022-11-18 James Fonteront: "Greetings of the day I am far more interested in writing a sponsored article on your website herongyang.com with 500+ words on ...

💬 2022-10-06 Ann: Contact greatsangomaa@yahoo.com for all your spell castings,he's so real that he charges after result

💬 2019-02-15 Julia: Nice website!

💬 2017-01-05 SOOZEE PALAMINOV: Dr. Herong ... I am super IMPRESSED with this website ... I found it by accident ... Greatly appreciated and Thank You very Much...

(More comments ...)

Full Version in PDF/EPUB
This section provices information on how to obtain the full version of this book in PDF, EPUB, or other format.
2025-10-28, ∼537🔥, 1💬

💬 2025-10-28 glch: Thanks, wish You success, from a novice MacOS'er

GetCurrencyRate - Usage Description
This section describes the free Web service, GetCurrencyRate, provided by kowabunga.net. It allows you to get the exchange rate between two given currencies on a given date.
2025-10-24, ∼689🔥, 2💬

💬 2025-10-24 Herong: Yes. This service is no longer available.

💬 2025-10-23 alex: it doesnt work

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