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PHP 8 quick reference for syntax, arrays, functions, classes, request data, files, JSON, exceptions, CLI commands, Composer, configuration, and PHP-FPM.

~/.bashrc controls aliases, functions, prompts, and other interactive Bash settings. See when it runs, what belongs inside it, and how to reload changes.

Regex syntax and examples for Linux tools, including metacharacters, quantifiers, character classes, anchors, groups, BRE, ERE, and PCRE ...

Quick reference for parted commands: inspect disks, create GPT and MBR tables, add aligned partitions, manage flags, resize boundaries, and remove partitions safely ...

Use the parted command to inspect disks, create GPT partition tables, add aligned partitions, resize boundaries, and remove partitions safely on Linux.

DNS record types map domains to servers, route email, publish verification data, and control certificate issuance. See zone-file examples and dig queries.

Linux storage works in layers: block device, partition, filesystem, mount point. This guide explains what each layer does and which command inspects it.

Quick reference for host discovery, port scanning, and service detection with nmap in Linux ...

Use lsblk to list disks, partitions, filesystems, UUIDs, and mount points in Linux, then customize columns and produce JSON output for scripts.

Follow Linux logs in real time with tail -F, filter live output with grep, pause with less +F, and stream systemd service logs with journalctl -f.