Fix xcrun: invalid active developer path

Fix xcrun: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun After recently updating my MacOS I encountered an error message xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun To resolve that we will need to reinstall xcode necessary components xcode-select –install […]

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How to set default group on new files or directory in Linux

I am managing a linux server where I want developers to run a springboot application which will generate files and folders. Those newly application created files and folders must inherit the parent group ID to let other developers manipulate the generated information. chmod g+s is for setting and inheriting the setgid. setfacl -m g::rwx is […]

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Search a word in a two dimensional array using Java

Overview I was playing this word search game with my children when I realized that I can create a simple Java application that search for words in a grid. You can checkout the source code at https://github.com/johnpili/search-a-word-in-a-two-dimensional-array-using-java Algorithm Concept Project Structure MainApp.java In this example, I created a 15×15 character array and populate it with […]

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Generating Subresource Integrity (SRI)

Since launching my online recruitment platform and job vacancy portal. I became interested in rolling out my own content delivery network (CDN) to host my portal’s images, javascript and CSS. Thanks to NGINX, implementing a CDN is easy. Of course we need to ensure that our digital assets are not compromised during transport so we […]

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Using MySQL TIMESTAMPDIFF to delete unverified user records

Building a public website with user registration and email verification is typical. It will require users to validate their email by clicking a unique generated URL link. Sometimes, user registration with pending verification will grow exponentially and needs an automated cleanup of records. In this example I created a simple MySQL stored procedure to delete […]

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How to connect to a Cisco VPN in Ubuntu 18.04 LTS

Here’s the simple steps for you to connect to a Cisco VPN in Ubuntu 18.04 LTS. Cisco, an American company is the leading provider and manufacturer of enterprise network devices, telecommunication hardware, networking security and networking software. According to computer profile as of April 2018, Cisco holds a 73.9% market which makes it the undisputed […]

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