Wednesday, March 4, 2026
New top story on Hacker News: Show HN: A shell-native cd-compatible directory jumper using power-law frecency
Show HN: A shell-native cd-compatible directory jumper using power-law frecency
7 by jghub | 0 comments on Hacker News.
I have used this tool privately since 2011 to manage directory jumping. While it is conceptually similar to tools like z or zoxide, the underlying ranking model is different. It uses a power-law convolution with the time series of cd actions to calculate a history-aware "frecency" metric instead of the standard heuristic counters and multipliers. This approach moves away from point-estimates for recency. Most tools look only at the timestamp of the last visit, which can allow a "one-off" burst of activity to clobber long-term habits. By convolving a configurable history window (typically the last 1,000+ events), the score balances consistent habits against recent flukes. On performance: Despite the O(N) complexity of calculating decay for 1,000+ events, query time is ~20-30ms (Real Time) in ksh/bash, which is well below the threshold of perceived lag. I intentionally chose a Logical Path (pwd -L) model. Preserving symlink names ensures that the "Name" remains the primary searchable key. Resolving to physical paths often strips away the very keyword the user intends to use for searching.
7 by jghub | 0 comments on Hacker News.
I have used this tool privately since 2011 to manage directory jumping. While it is conceptually similar to tools like z or zoxide, the underlying ranking model is different. It uses a power-law convolution with the time series of cd actions to calculate a history-aware "frecency" metric instead of the standard heuristic counters and multipliers. This approach moves away from point-estimates for recency. Most tools look only at the timestamp of the last visit, which can allow a "one-off" burst of activity to clobber long-term habits. By convolving a configurable history window (typically the last 1,000+ events), the score balances consistent habits against recent flukes. On performance: Despite the O(N) complexity of calculating decay for 1,000+ events, query time is ~20-30ms (Real Time) in ksh/bash, which is well below the threshold of perceived lag. I intentionally chose a Logical Path (pwd -L) model. Preserving symlink names ensures that the "Name" remains the primary searchable key. Resolving to physical paths often strips away the very keyword the user intends to use for searching.
Tuesday, March 3, 2026
Monday, March 2, 2026
मौसम विभाग का पूर्वानुमान: सावधान! तपिश भरे रहेंगे अगले 90 दिन, कई राज्यों में सामान्य से अधिक लू चलने के आसार
Weather forecast: Beware! next 90 days will be sweltering, with more severe heat waves expected in many states - मौसम विभाग का पूर्वानुमान: सावधान! तपिश भरे रहेंगे अगले 90 दिन, कई राज्यों में सामान्य से अधिक लू चलने के आसार
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Sunday, March 1, 2026
Saturday, February 28, 2026
News: पश्चिम एशिया में एयरस्पेस बंद, 444 अंतरराष्ट्रीय उड़ानें होंगी रद्द; मणिपुर में चार उग्रवादी गिरफ्तार
News Updates Of 1 March: News Updates, India News, PM Modi, President Murmu, News in Hindi - News: बोलिविया हादसे पर भारत ने जताया दुख; पश्चिम एशिया में एयरस्पेस बंद, 444 अंतरराष्ट्रीय उड़ानें होंगी रद्द
from Latest And Breaking Hindi News Headlines, News In Hindi | अमर उजाला हिंदी न्यूज़ | - Amar Ujala https://ift.tt/wcOMqzT
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from Latest And Breaking Hindi News Headlines, News In Hindi | अमर उजाला हिंदी न्यूज़ | - Amar Ujala https://ift.tt/wcOMqzT
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