Avoiding Multiprocessing Errors in Bash Shell
Suppose you have two Linux processes trying to modify a file at the same time and you don’t want them stepping on each other’s work and making a mess. A common solution is to use a “lock” mechanism (a.k.a. “mutex”). One process “locks the lock” and by this action
Read moreHow to Boost WordPress Security and Protect Your SEO Ranking
Learn tips and strategies to identify and address common WordPress security issues to protect your website and search rankings. Continue reading How to Boost WordPress Security and Protect Your SEO Ranking on SitePoint.
Read moreThis-way-up and Knuth arrows
I was looking today at a cardboard box that had the “this way up” symbol on it and wondered whether there is a Unicode value for it. Apparently not. But there is an ISO code for it: ISO 7000 symbol 0623. It’s an international standard symbol for indicating how to
Read moreUnderstanding How ChatGPT Maintains Context
The concept of context in conversation is crucial, as it allows for coherent and meaningful exchanges. But how does ChatGPT keep context? Continue reading Understanding How ChatGPT Maintains Context on SitePoint.
Read moreFactoring pseudoprimes
Fermat’s little theorem says that if p is a prime number, then for any positive integer b < p we hve bp-1 = 1 (mod p). This theorem gives a necessary but not sufficient condition for a number to be prime. Fermat’s primality test The converse of Fermat’s little theorem
Read moreBuilding a PDF larger than the known universe
On this home team episode: Massachusetts makes a welcome shift toward skills-based hiring, AI-generated content robs us of our appetite for mac and cheese, and large-scale crypto mining operations account for more than 2% of the US’s electricity generation. Plus: A PDF quite a bit bigger than Germany.
Read more