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PID controller: modeling P I D parts

https://sudonull.com/pid-controller-modeling-p-i-d-parts

Breakdown of PID controller via FDTD simulation of heater and mechanics. Code in Mathematica, error elimination, coefficient tuning. Study principles for embedded systems.

df du differ: find deleted files Linux

https://sudonull.com/df-du-differ-find-deleted-files-linux

Breaking down why df shows 95% usage, and du — 20%. Step by step: lsof +L1 for search, > /proc/PID/fd/FD for cleanup without restart. copytruncate in logrotate. For sysadmin and DevOps.

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