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One point for every published article.
How to find an open deleted file using lsof and verify space reclamation. A real test with two file descriptors: why du decreases immediately, but available space reported by df only grows after the last FD is closed.
We examine latency, queue depth, and I/O operations, accounting for SSDs, virtual disks, and the difference between the first report and subsequent intervals.
We test connection, login, and table reading separately. A real MySQL 8.0.46 testbed demonstrates the differences between errors 2003, 1045, and 1142, as well as a successful ping.
Already selling on marketplaces? An own online store will help reduce dependence on platforms, build your own customer base, and create additional opportunities for profit growth.
We compare the checksum of a downloaded archive against a trusted value and explain what this verification proves and what it does not confirm.
Use namei and stat to check the entire file path, owner, and access mode before changing the site directory permissions.
How to use timedatectl to distinguish between a time zone error and clock desynchronization, and gather data before manually adjusting the time.
A quick HTTP check with a timeout: distinguish connection errors from server responses and do not treat cumulative timings as independent stages.
How to view DNS servers and name resolution rules in a systemd-resolved system, especially with VPNs and multiple network interfaces.
How to read a dig DNS response: real examples of NOERROR with addresses, empty NODATA responses, and NXDOMAIN. Status, TTL, and the next verification step without changing the network.
Quick diagnostics with ip: interfaces, addresses, and the selected route to the recipient. Helps gather facts without risking loss of remote access.
How to link a timer to the service it launches, verify past and next executions, and avoid mistaking an active timer for a successful task.
