The sort command sorts lines of text files alphabetically or numerically. This guide covers sorting by column, reverse order, unique lines, and combining sort with other commands.
journalctl queries the systemd journal and lets you filter logs by unit, time, priority, boot, and process. This guide covers the most useful journalctl options with practical examples.
The patch command applies diff files to original files in Linux. This guide covers basic usage, strip paths, dry run, backup, and reversing patches with examples.