Mastering journalctl: Powerful Techniques to Query systemd Logs

This guide explains how to use the journalctl command to view, filter, and manage systemd-journald logs on Linux, covering help options, match expressions, persistent storage, disk usage, vacuuming, time ranges, unit filtering, priority levels, real‑time streaming, output formatting, and kernel log access.

Operationsjournalctllog-management

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Mastering journalctl: Powerful Techniques to Query systemd Logs

Liangxu Linux

Jul 8, 2020 · Operations

How to Delete Log Files Recursively and Free Disk Space on Linux

This article walks through common interview questions about removing log files, demonstrates safe recursive deletion with find, explains why deleted files may still occupy space when opened, shows how to identify and clean them using lsof, logrotate, and crontab, and clarifies the differences between soft and hard links.

Hard Linkfindlog-management

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How to Delete Log Files Recursively and Free Disk Space on Linux