Notes

Running Elixir’s Interactive Shell (iex) in Powershell

ppolyzos February 10, 2017 4007 0 Comment

IEx is Elixir’s interactive shell, where you can type any Elixir expressions and get its result. One issue you might come across when trying to use iex in Powershell, through a command e.g. iex -S mix, you might get the following error:

Invoke-Expression : A parameter cannot be found that matches parameter name 'S'.
At line:1 char:5
+ iex -S mix
+     ~~
    + CategoryInfo          : InvalidArgument: (:) [Invoke-Expression], ParameterBindingException
    + FullyQualifiedErrorId : NamedParameterNotFound,Microsoft.PowerShell.Commands.InvokeExpressionCommand

Invoke-Expression : A parameter cannot be found that matches parameter name 'S'.

At line:1 char:5

+ iex -S mix

+ ~~

+ CategoryInfo : InvalidArgument: (:) [Invoke-Expression], ParameterBindingException

+ FullyQualifiedErrorId : NamedParameterNotFound,Microsoft.PowerShell.Commands.InvokeExpressionCommand

The problem is that iex is an alias in Powershell, for Invoke-Expression

PS C:\Workspace> Get-Command iex

CommandType     Name                       Version    Source
-----------     ----                       -------    ------
Alias           iex -> Invoke-Expression

PS C:\Workspace> Get-Command iex

CommandType Name Version Source

----------- ---- ------- ------

Alias iex -> Invoke-Expression

Solution To overcome this problem you simply use iex.bat…

Response caching & GZip compression in asp.net core web application

ppolyzos February 5, 2017 3139 4 Comments

.NET

Some really easy ways to improve performance in your asp.net core web application are: response caching, which adds cache-related headers to responses, to reduce the number of requests a client makes to your web server; compressing response using gzip to reduce its size. You may start with the default asp.net core web application, apply the above steps and check the result. Setup…

How to update environment variables based on a response in Postman

ppolyzos November 20, 2016 8047 8 Comments

Notes

Sometimes, the response from a request is required first in order to continue with all the other API requests currently stored in your Postman folders. Think of a request that, in order to return results, it requires from you to be authenticated, so a typical workflow would be: authenticate yourself with a proper username and password; get an authentication token; update…

EF code first: creating string Index error

ppolyzos November 15, 2016 2470 0 Comment

Notes

In Entity Framework code-first, if you have a domain model like the following:

public class Country
{
    public int Id { get; set; }

    [Index]
    public string IsoCode { get; set; }
}

public class Country

{

public int Id { get; set; }

[Index]

public string IsoCode { get; set; }

}

and want to create an index for a string property, when you execute update-database for your migration, you may end up with the following error: This usually happens when you use VARCHAR(max), which is the default column type when creating a string property in EF. To make…

Yarn vs NPM speed test

ppolyzos October 29, 2016 3026 0 Comment

Notes

A couple of days ago Facebook released Yarn, a new package manager for Javascript, with a focus on speed and consistent package dependency management across machines. With Yarn, engineers still have access to the npm registry, so I thought it worth the try to test the claimed speed improvements between package installation using yarn and npm default installation process. For my tests I used ng-lightning, a project for…

Auto Shutdown Windows from command line

ppolyzos September 27, 2016 1963 0 Comment

Notes

Sometimes, it is helpful to be able to set a timer to auto shutdown your PC, after a certain amount of time. In Windows 10 you can do that through many ways, but essentially, using the same command. Command Prompt Type shutdown -s -t 300 where 300 is the amount of seconds to wait till the shutdown start (around 5 minutes) Powershell The…

dotnet: command not found (mac OS X) quick fix

ppolyzos September 21, 2016 2549 0 Comment

Notes

In order to use .NET Core on your Mac, you first need to install the latest version of OpenSSL. The easiest way to get this is from Homebrew.

~$ /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

1	~$ /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

After installing brew, you need to do the following:

~$ brew update
~$ brew install openssl
~$ ln -s /usr/local/opt/openssl/lib/libcrypto.1.0.0.dylib /usr/local/lib/
~$ ln -s /usr/local/opt/openssl/lib/libssl.1.0.0.dylib /usr/local/lib/

~$ brew update

~$ brew install openssl

~$ ln -s /usr/local/opt/openssl/lib/libcrypto.1.0.0.dylib /usr/local/lib/

~$ ln -s /usr/local/opt/openssl/lib/libssl.1.0.0.dylib /usr/local/lib/

When trying to initialize a basic .NET project through dotnet new or restoring packages on an existing one, using dotnet restore, you might come across…

Redis Server on Bash on Windows

ppolyzos August 4, 2016 6793 4 Comments

Notes

If you are a developer on a Windows machine and you want to access a Redis Server while you build your application, you have several options; one of them is to use the Redis port on Windows project by MSOpenTech, download the latest binaries and have your Redis Server running on Windows. Another option is to have a Linux VM running on your machine and connect to it whenever you need it….

Install and change default language on Bash on Ubuntu on Windows

ppolyzos August 3, 2016 7056 4 Comments

Notes

Windows 10 Anniversary update offers a new feature for developers, an Ubuntu-based Bash shell that can run Linux software directly on Windows. How to install it First of all, you need to enable the Developer Mode on Windows 10. To do so, open Settings app and head to Update & Security. Then on the left side click on For Developers option and finally, activate the Developer Mode…

Cross Database Queries in Azure SQL databases

ppolyzos July 30, 2016 7584 7 Comments

Articles

In Azure if you have two or more SQL Databases and you want to perform a query across them, you might come across the following error:

Reference to database and/or server name in '[database table]' is not supported in this version of SQL Server.

1	Reference to database and/or server name in '[database table]' is not supported in this version of SQL Server.

In order to perform cross database queries among SQL Azure databases you need to use the elastic database query feature. What is the Elastic Database Query Feature? The elastic database query feature enables you to run a Transact-SQL query…

Running Elixir’s Interactive Shell (iex) in Powershell

Response caching & GZip compression in asp.net core web application

How to update environment variables based on a response in Postman

EF code first: creating string Index error

Yarn vs NPM speed test

Auto Shutdown Windows from command line

dotnet: command not found (mac OS X) quick fix

Redis Server on Bash on Windows

Install and change default language on Bash on Ubuntu on Windows

Cross Database Queries in Azure SQL databases

Publish an Angular web app to Azure using GitHub, AzureDevOps & Azure Storage Account

JavaScript Console Tips & Tricks

Different options to upload single or multiple files to your Azure Storage Account