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"docker container list --all" - List All Containers
How to list all containers on the Docker Engine with "docker container list --all" command? The default "docker container list" or "docker ps" command lists only running containers. If you want to see all containers including those that were stopped, you need to use the "--all" option. Here is a lis...
2019-04-16, ∼2618🔥, 0💬

Icon for Atom Syndication
What Is the Icon for Atom Syndication? The Web browser and Website syndication industry has adopted a standard icon to identify Atom syndicated content as shown below: Atom Syndication Feed Icon   ⇒ MIME Type Definition for Atom Files ⇐ Real Atom XML Examples ⇑ Introduction of Atom ⇑⇑ RSS FAQ and ...
2017-12-21, ∼2618🔥, 0💬

HTML 'del' and 'ins' Tags/Elements
What Are HTML "del" and "ins" Tags/Elements? "del" and "ins" elements are inline elements that you can use to specify text to be treated as deleted text and inserted text respectively. Here are basic rules about "del" and "ins" elements: "del" and "ins" elements are inline elements. "del" and "ins" ...
2017-04-28, ∼2618🔥, 0💬

'cellspacing' - White Spaces between HTML Table Cells
How To Control White Spaces between Table Cells? White spaces between cells refer to the vertical space between a upper cell and a lower cell in a table column, and the horizontal space between a left cell and a right cell in a table row. If inner borders are turned on, white spaces between cells ap...
2017-05-13, ∼2617🔥, 0💬

What Is Distributed Ledger
What Is distributed ledger? A distributed ledger, also called Distributed Ledger Technology (DLT), is a consensus of replicated, shared, and synchronized data storage based the blockchain technology. The Distributed Ledger Technology can be used to change the way we do business today in many areas. ...
2023-03-28, ∼2616🔥, 0💬

Determining If a Session Is New in PHP
How To Determine If a Session Is New in PHP? There is not direct way to tell if a session is new or old. But you can design your site to have a required session value in all sessions. Then you can check the existence of this value in a session to determine if it is a new session by isset($_SESSION['...
2016-10-24, ∼2614🔥, 0💬

Access Class Properties through Instance Name
Can I access class properties through an instance name? Yes, you can access class properties through an instance name, as long as there is no instance property that has the same name as a class property. When you reference a property through the instance name in the following form: instance_name.pro...
2022-09-24, ∼2612🔥, 0💬

Defining and Using Class for New Data Types
Where to find tutorials on Defining and Using Class for New Data Types in Python? Here is a list of tutorials to answer many frequently asked questions compiled by FYIcenter.com team on Defining and Using Class for New Data Types in Python: What Is Class 'class' - Class Definition Statements Classes...
2018-05-08, ∼2612🔥, 0💬

Verifying If a Key Exists in an Array in PHP
How Do You Know If a Key Is Defined in an Array in PHP? There are two functions can be used to test if a key is defined in an array or not: array_key_exists($key, $array) - Returns true if the $key is defined in $array. isset($array[$key]) - Returns true if the $key is defined in $array. Here is a P...
2017-01-29, ∼2612🔥, 0💬

URL Starts with Path or File name
What Happens If a URL Starts with Path or File name? If a URL starts with a path name, the browser will borrow the protocol name, the host name, and the port number from the URL of the current document to make up the missing parts. For example, if the following URL is used in this document you are v...
2017-07-07, ∼2610🔥, 0💬

HTML Document Example
What Does an HTML document look like? An HTML document is a normal text file with predefined tags mixed with the text contents of the document. Tags are enclosed in pairs of angle brackets: "&lt;" and "&gt;". Below is how a simple HTML document looks like if you open it in a text editor: &am...
2017-02-20, ∼2608🔥, 0💬

What Is basic-network Sample Network
What is basic-network Sample Network? basic-network is a Hyperledger Fabric network example included in the "Samples, Binaries and Docker Images" package. The basic-network Sample Network provides scripts and configuration files to create a simple Hyperledger Fabric network with a single organizatio...
2020-04-25, ∼2607🔥, 0💬

Retrieving Input Values from Checkboxes in PHP
How To Retrieve Input Values for Checkboxes Properly in PHP? If multiple input values are submitted with the same field name, like the case of a group of checkboxes, you should add ([]) to the end of the field name. This tells the PHP engine that multiple values are expected for this field. The engi...
2016-11-13, ∼2607🔥, 0💬

Ampersand Sign in HTML Attribute Values
How To Write Ampersand Sign in Attribute Values? If you need enter an ampersand sign in an attribute value, you can not enter it directly. You must replace it with entity: &amp;amp;. Here are some interesting examples of quoted attribute values: &lt;img src="tt.gif" alt="Tutorials &amp;a...
2023-09-23, ∼2604🔥, 0💬

Register Azure AD B2C Application
How to register my application as an Azure AD B2C application in my Azure AD B2C account? If you want to register an application as an Azure AD B2C application in your Azure AD B2C account, your application should be: Able to allow users who are members and their identities are managed locally in th...
2019-03-08, ∼2602🔥, 0💬

HTML Versions and Variations
What are versions and variations of the HTML standard? HTML was developed by Tim Berners-Lee in 1980. HTML Inventor: Tim Berners-Lee Since then, a number of versions and variations of the HTML standard were published: HTML 5.1 was published as a W3C Recommendation on November 1, 2016. HTML5 was publ...
2017-02-20, ∼2601🔥, 0💬

Generating JSON Strings in Pretty Format
How to generate JSON strings in pretty format using json.dumps()? You can control the JSON output string format with "indent", "separators" and "sort_keys" arguments of the json.dumps() function: Here is a Python example that generates a pretty formatted JSON string with property keys sorted: &g...
2018-10-08, ∼2600🔥, 0💬

Python Built-in Structured Data Types
Python Built-in Structured Data Types? Python Built-in Structured Data Types are data types provided by the Python interpreter to represent structures of data values: Here is a list of commonly used Python Built-in Structured Data Types: "str" - String data type for sequences of Unicode characters, ...
2018-04-07, ∼2599🔥, 0💬

Default Protocol and Port Number of a URL
What Happens If Protocol or Port Number Is Missing in a URL? From a syntax point of view, all URL parts are optional. If some parts are not included in a URL, the browser and the hosting computer will provide default values. Here are some rules about the protocol name, host name, and port number: 1....
2017-07-07, ∼2599🔥, 0💬

View Effective Policy of API Operation - 2017 Version
How to View Effective Policy of an API Operation 2017 version? My API operation is not calling the backend service. If your API operation is not calling the backend service, you need to view the effective policy of the API operation to see why backend service is not called. 1. Go to the publisher po...
2018-07-18, ∼2598🔥, 0💬

Atom Feed Files Are XML Documents
Are Atom Feed Files XML Documents? Yes. Atom feed files are XML (eXtensible Markup Language) documents. Atom feed files must be well-formed XML documents, respecting the following XML rules. The first line must be the "xml" processing instruction with "version" and "encoding" attributes. There must ...
2017-12-09, ∼2597🔥, 0💬

Copying a File in PHP
How To Copy a File in PHP? If you have a file and want to make a copy to create a new file, you can use the copy() function. Here is a PHP script example on how to use copy(): &lt;?php unlink("/temp/myPing.exe"); copy("/windows/system32/ping.e xe","/temp/myPing.exe"); if (file_exists("/temp/myPi...
2016-11-20, ∼2597🔥, 0💬

Introduction of RSS
Where to find tutorials in understanding what is RSS? Here is a list of tutorials to answer many frequently asked questions compiled by FYIcenter.com team in understanding what is RSS. What Is RSS (Rich Site Summary) What Is the Relation between RSS and XML Versions of RSS Specifications Real RSS XM...
2018-01-08, ∼2593🔥, 0💬

'float' Literals and Conversions
How to specify "float" values in Python code? "float" values can be specified using "float" literals or the float() conversion function as shown in this tutorial: 1. "float" literals in scientific notations as shown below: &gt;&gt;&gt; 3.14159 3.14159 &gt;&gt;&gt; -2.14 -2.14...
2018-04-07, ∼2589🔥, 0💬

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