Linux terms
The operating system underneath almost everything in production
Linux runs the servers, containers, and cloud instances that power most production software. This category covers shell commands, file systems, process management, permissions, networking tools, cron jobs, and the system internals that every backend developer benefits from understanding. Knowing your way around Linux is not optional when something breaks at 2am.
Linux File Permissions
Read, write, and execute permissions assigned to owner, group, and others — the foundation of Linux access control for web application files.
CWE-732 OWASP A5:2021
1mo ago
linux beginner
7.5
Linux Log Files
Log locations, rotation, and analysis tools on Linux — /var/log/ structure, journald, logrotate, and essential log analysis commands.
2mo ago
linux intermediate
Linux Memory Management
How Linux allocates RAM — virtual memory, the page cache, swap, and the OOM killer — and what PHP developers need to know when PHP processes run out of memory.
2mo ago
linux intermediate
Linux Networking Tools PHP 5.0+
Essential tools for diagnosing network issues on Linux servers — ss, netstat, curl, dig, tcpdump, and ping each reveal different layers of connectivity problems.
2mo ago
linux intermediate
Linux Package Managers
apt (Debian/Ubuntu), yum/dnf (RHEL/CentOS/Fedora), apk (Alpine) — tools for installing, updating, and managing system software packages and their dependencies.
2mo ago
linux beginner
Linux Performance Tools
Essential tools for diagnosing CPU, memory, IO, and network performance on Linux — top, htop, vmstat, iostat, perf, strace, and ltrace.
2mo ago
linux intermediate
Linux User & Group Management
Managing users and groups on Linux servers — useradd, usermod, passwd, groups — and best practices for PHP web server user isolation and privilege separation.
2mo ago
linux intermediate
Linux File System Hierarchy
The standard directory structure of Linux — /etc for config, /var for variable data, /tmp for temporary files, /usr for user programs — knowing it prevents misplacing files.
2mo ago
linux beginner
Linux Processes PHP 5.0+
Every running program is a process with a PID, memory space, and file descriptors — ps, top, kill, and signals are the essential tools for managing them.
2mo ago
linux intermediate