head and tail on Linux: Show First and Last Lines of Files
Use head and tail on Linux: head -n 20 start of logs, tail -n 50 end, head for…
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uniq Command on Linux: Count Duplicate Lines (with sort)
Use uniq on Linux after sort: uniq -c count repeats, -d show duplicates only, -u unique lines, skip…
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sort Command on Linux: Sort Lines, Numbers and Log Columns
Use sort on Linux for text and numbers: sort -n numeric, -k key fields, -r reverse, -u unique,…
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Grep Log Errors and Alert Shell Script (grep, Slack or Email)
Scan Linux log files for ERROR or CRIT lines with a Bash script: tail window, grep patterns, webhook…
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logrotate on Linux: Configure Log Rotation (/etc/logrotate.d)
Configure logrotate on Linux: /etc/logrotate.conf, per-app files in logrotate.d, daily/weekly rotation, compress, copytruncate, and test with logrotate -d.
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Linux tail -f Command: Follow Log Files Live (nginx, apps, journalctl)
Use tail -f on Linux to follow log files in real time: -n line count, grep while tailing,…
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Docker logs and docker exec: Debug Containers on Linux (Compose Included)
Debug Docker on Linux: docker logs --tail and -f, docker ps -a exit codes, docker exec into containers,…
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awk and sed on Linux: Cut Columns, Search-Replace and Log Parsing
Use awk and sed on Linux to extract columns, filter lines, substitute text, edit files safely, and chain…
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grep Command on Linux: Search Files, Logs and Pipelines (with Regex Basics)
Use grep on Linux to search files and command output: -i, -r, -n, context lines, extended regex, include/exclude…
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