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Sushovan Mukherjee

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Author: Sushovan Mukherjee

Hello my name is Sushovan Mukherjee, and I am the Co-Founder of Defineway Technologies Private Limited, which is our Web, App, Software Development company. I specialize in any web, app, software development with any programming language. My favourite programming languages are: PHP, ColdFusion, Java, C#, Ruby, PowerShell, Python, Go, etc. Also, I have a extensive knowledge in Server Administration, Cyber Security, DevOps Engineering. I love to listen classical music, watch football matches.
Sushovan Mukherjee September 1, 2024 No Comments

Create a wildcard domain certificate from LetsEncrypt

To generate a wildcard domain certificate, you can use docker. It’s my first choice because we don’t have to install additional software; all will be…
Sushovan Mukherjee September 1, 2024 No Comments

Watch a website’s HTTP status code

Sometimes, during system administration or web application repair, we had to watch the status code it returned. To check a website’s status code, you can…
Sushovan Mukherjee September 1, 2024 1 Comment

Fix for docker eats up disk space

We use Docker Desktop in our daily lives, but we often forget to maintain a few things. As a result, the Docker Desktop application almost…
Sushovan Mukherjee August 25, 2024 No Comments

How to fix too many open files problem in Linux

System Administrators might have encountered the problem of “Too many open files” when dealing with dedicated web servers. But you can see that the file…
Sushovan Mukherjee August 5, 2024 No Comments

How to install Microsoft SQL Server on MacOS

You can install Microsoft SQL Server on Windows and Linux Operating Systems. However, you can use the docker system to install it on MacOS. Prerequisites…
Sushovan Mukherjee July 27, 2024 No Comments

How to check domain SSL certificate expiry with PowerShell

Suppose you have multiple domains and need a script to check the SSL certificate validity with one script. Then, you can use that script in…
Sushovan Mukherjee July 20, 2024 No Comments

How to handle CNAME flattening problem for APEX Domains

You might have heard many DNS providers don’t support CNAME flattening for root (APEX) domains. Now, there are many questions: What’s the problem? It’s good.…
Sushovan Mukherjee July 17, 2024 No Comments

Where to store SSH key in Azure

You can create an SSH key pair with SSH keys from the Azure portal. However, it will save only the public key, not the private…
Sushovan Mukherjee July 16, 2024 No Comments

jQuery – .attr() vs .prop()

jQuery .attr() and .prop() both are almost same with some differences. With .attr() you can get or set the HTML attribute. With .prop() you can…
Sushovan Mukherjee July 16, 2024 No Comments

US and Canada ZIP code validation with JavaScript

I have copied it from my code, please feel free to change it as required. let usZipPattern = new RegExp("^\\d{5}(-{0,1}\\d{4})?$"); let caZipPattern = new RegExp(/([ABCEGHJKLMNPRSTVXY]\d)([ABCEGHJKLMNPRSTVWXYZ]\d){2}/i);…

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