Tutorial by Topics: en

When a docker build -t mytag . fails with a message such as ---> Running in d9a42e53eb5a The command '/bin/sh -c returned a non-zero code: 127 (127 means "command not found, but 1) it is not trivial for everybody 2) 127 may be replaced by 6 or anything) it may be non trivia...

Often the server needs to serve pages dynamically.For an example an user Mr.X visits the page and sees some thing like "Welcome Mr. X to my homepage".In this case views can be helpful.Even to populate a table view can be handy. Variables can be injected into HTML dynamically using view eng...

Authentication is the process of verifying the identity of a client. When access control, i.e. authorization, is enabled, MongoDB requires all clients to authenticate themselves in order to determine their access. MongoDB supports a number of authentication mechanisms that clients can use to verify...

A hub in VSTS is a section grouping the features based on similar functionality e.g. Code, Build etc. VSTS comes with a capability where we can extend the hubs by adding more functionalities related to current hub, making the hub more usable for the given scenario or requirement of functionality. ...

Ajax uses the HTTP Protocol and can send requests using POST/GET methods from Client to Server. WebSocket is itself a protocol to communicate between Client and Server, distinct from HTTP. In Ajax when you send a request , server sends response for that request and connection ends. Using WebSocke...

This client downloads a complete copy of the headers for all blocks in the entire block chain. This means that the download and storage requirements scale linearly with the amount of time since Bitcoin was invented.

JSF as a markup language, supports comments of some parts of code, but we have be carefully, because if we use a normal HTML comment code like this: <!-- I want to comment the next button --> <!-- <h:commandButton value="Push" onclick="alert('He...

With the pointer-events property, you can control wich part of your drawing will react to pointer events.

If you commit sensitive data, such as a password or SSH key into a Git repository, you can remove it from the history. To entirely remove unwanted files from a repository's history you can use either the git filter-branch command or the BFG Repo-Cleaner. Tell your collaborators to rebase, ...

COMMMENT main purpose is to define or change a comment on database object. Only a single comment(string) can be given on any database object.COMMENT will help us to know what for the particular database object has been defined whats its actual purpose is. The rule for COMMENT ON ROLE is that you m...

The data.table package has undergone a number of changes and innovations over time. Here are some potential pitfalls that can help users looking at legacy code or reviewing old blog posts.

Examples on how to save the created Excel sheet to the Disk or send it to the Browser.

How to style Cells with font types, background color, border styles etc.

This topic covers the basics of concurrency in C++ using OpenMP. OpenMP is documented in more detail in the OpenMP tag. Parallelism or concurrency implies the execution of code at the same time. OpenMP does not require any special headers or libraries as it is a built-in compiler feature. How...

How to fill your created Excel sheet with data from different sources.