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Category: Web Development

QR Codes in Time and Attendance Applications

QR Codes in Time and Attendance Applications Nowadays, QR Codes or “Quick Response Codes” are ubiquitous. They can be seen everywhere and in myriads of aesthetic variations. However, they exist for one purpose and one purpose alone: data storage. Among others, QR codes contain (1) website URLs that triggers browsers to go to that website; (2) phone numbers and business cards that automatically get stored in mobile phones; and (3) inventory codes that let business owners track and manage assets they own.

A QR Code is easy to read. It does not require any specialized equipment to capture its encoded content. It only needs a computer with a camera attached to it. In this regard, any smart phone, laptop, or tablet with a QR Code reader App can be used. Moreover, QR Codes contain more data than the standard UPC barcodes. Further, and most importantly, QR Codes can be read faster than traditional encoded badges.

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How to Purge Linux’s Cached Memory

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If like me, you manage your own Linux servers, it is essential to know how to release its cached memory. In a nutshell, Linux always tries to use RAM to speed up disk operations. It uses available memory for buffers (file system metadata) and cache (pages with actual contents of files or block devices). This helps the system to run faster because disk information is already in memory which saves I/O operations. If space is needed by programs or applications like MySQL, Linux will free the buffers and cache to provide memory where it is needed.

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