Linux & System Administration

Guide: Change Linux hostname- edit /etc/hostname and /etc/hosts or run sudo hostnamectl set-hostname newname (or sudo hostname newname), then reboot or restart networking to apply.

Linux terminal screenshot showing how to ping an IP address: 'ping <IP>' entered, ICMP reply lines with bytes, ttl, time, plus packet statistics and round-trip min/avg/max values..

The /proc directory in Linux is a virtual filesystem exposing kernel and process information as files and directories, enabling monitoring and configuration without disk storage...

Terminal displaying Linux system logs: journalctl output, tail -f /var/log/syslog, grep filtering and timestamps; visual guide to viewing and monitoring system logs for debugging...

Illustration of the Linux PATH variable: a shell searching colon-separated directories (/usr/local/bin:/usr/bin:/bin), showing how commands are found and executed in order.(search)

Illustration showing how to enable SSH on Ubuntu: open Terminal, install and start OpenSSH server, enable service, adjust firewall, verify remote login with ssh user@hostname (SSH)

Illustration of a system administrator holding a golden key labeled root above a server rack, representing highest privileges and full control of a Unix/Linux system. (superuser!).

How to Change File Ownership in Linux File ownership represents

Screenshot of Linux terminal and system monitor showing memory usage graphs, swap activity, top processes by RAM, free/used values, commands free, top, htop, vmstat for diagnostic

Terminal showing Linux command to extract a .tar.gz archive using 'tar -xzf archive.tar.gz', with extracted folder contents and progress listed in output now.