Git
How to Use git log Formats Graphs and Filters Step by Step
Use git log formats, graphs and filters: oneline graph views, custom pretty formats, date and author filters, branch ranges, and a one-line alias.
6 min read
Tag
logging
7 posts
Docker
How to Inspect Docker Logs and Rotate Them the Safe Way
Read Docker container logs with docker logs, filter by time, set up json-file rotation with max-size and max-file, and choose another driver for production.
6 min read
Shell Scripting
How to Write Logs From a Shell Script to syslog and journald
Log from a shell script to syslog and journald with logger, set tags and priorities, read the entries back with journalctl, and keep stdout clean for data.
6 min read
Cron and Scheduling
How to Rotate Logs on a Schedule With logrotate and cron
Rotate logs on a schedule with logrotate: config syntax, daily or size rotation, copytruncate versus postrotate, testing with -d and how it is triggered.
6 min read
Security
How to Check Who Changed What With Logs and history
Find out who changed what on a Linux system: auth logs, sudo logs, shell history limits, journalctl, package history, file mtimes and auditd rules.
6 min read
CI/CD
How to Handle Secrets in CI Logs and Avoid the Pitfalls
Keep secrets out of CI logs: masking limits, set -x and env dumps, command-line arguments, error messages, derived values and what to do after a leak.
6 min read
Text Processing
How to Use awk to Parse Logs and Build Reports the Safe Way
Use awk to parse logs and build reports: field splitting, counting by key, sums and averages, time buckets, sorted summaries and END blocks.
6 min read