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Blog of Computing and Programming. This blog provides useful, and well-written articles related to computing, programming, algorithms, data structures and online tools. Algorithms, Blockchain and Cloud.
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Hardening MySQL File Access with local_infile=0 and secure_file_priv=NULL
MySQL needs permission to read and write ordinary database files, but most application databases do not need SQL statements to exchange arbitrary files with the operating system. If a server exists primarily for WordPress or another web application, leavi
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Accidentally Deleting Over 18,000 Files with Shift+Delete: Recovering Data from a Surface SSD Using WinFR
While freeing space on my Surface Laptop Studio 2, I accidentally used Shift+Delete to permanently remove the C:tests directory, which unexpectedly contained photographs from a trip to Switzerland. This article documents my attempts to recover the data us
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Teaching Kids Programming - Minimum Number of Perfect Squares via Theorem-guided iterative deepening DFS
This article explores an iterative-deepening recursive solution to LeetCode 279, Perfect Squares. By combining depth-limited search with Lagrange's Four Square Theorem, we only need to test whether a number can be represented using one, two, or three perf
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Hardening WordPress: Disable PHP Execution in wp-content/uploads
caption id="attachment_26281" align="alignnone" width="383" wordpress/caption WordPress must be able to write media files to wp-content/uploads, but files stored there should never need to execute as PHP. This article explains how to block PHP-like files
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Turning a Dusty Mini PC into a Home Server: My NUC-8's Second Life
I gave an unused Beelink SEi8 mini PC a second life by installing Ubuntu and turning it into a home server. It now runs a STEEM node, Node.js applications, databases, a reverse proxy and Cloudflare Tunnel. The article also explains how double NAT allows t
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