Linux

Linux disk space issues persist when processes hold open file descriptors to deleted files, preventing space reclamation. Additionally, hidden consumers like systemd journals, Docker overlays, and filesystem snapshots silently occupy disk space without obvious directory footprints.

To avoid Linux permission traps with chmod and chown, verify directory traversal permissions and understand ACL interactions. Misconfiguring recursive ownership or ignoring execute bits on directories causes silent failures and blocks legitimate access to files and applications.

The rm -rf command on Linux carries hidden pitfalls including unintended deletion through symlink loops and glob expansion errors. It silently removes critical system directories if paths contain trailing spaces or variables resolve unexpectedly during command execution.

Troubleshoot Linux cron and systemd silent failures by checking service exit codes, verifying environment variable differences between interactive and non-interactive shells, and inspecting journalctl logs for masked error output from background scheduled tasks.

Standard Linux commands like df and du give misleading information during inode exhaustion, when filesystems use thin provisioning, or when processes mask memory usage. Top also obscures actual memory consumption by not clearly differentiating active and cached pages.

Yes, understanding Linux command-line utilities and system administration concepts is required. You must differentiate between kill signals, interpret process states, and navigate filesystem behaviors to accurately diagnose process hangs and memory leaks.