Linux & System Administration

Terminal showing disk usage in Linux: 'df -h' output listing partitions, sizes, used and available space, percentages, a graphical bar, colored bars and icons indicating near-full.

Isometric scene: dark terminal with glowing rim and blinking cursor between an original folder (chip emblem) and a link folder (curved arrow), joined by a glow chain and subtle Tux.

Displays filesystem disk space usage, reporting total, used, and available blks and mount points; supports options like -h for human-readable sizes and -T to show filesystem types.

Terminal showing 'mv' command usage: move files between directories, rename files, and update paths; examples: mv file.txt /dest/, mv oldname.txt newname.txt; common options -i, -v

How to Copy Files Using cp Command File management forms the backbone

Terminal window showing Linux commands: user typing 'mkdir new_folder' then 'ls' to verify, illustrating how to create a directory, set permissions, and navigate into it with 'cd'.

Diagram of Linux swap space: reserved disk area used as virtual memory when RAM is full, showing pages moved between RAM and swap to free RAM and maintain system responsiveness....

Illustration of a Linux terminal demonstrating pkill and killall to stop procs by name, showing usage examples, signal options, process names, and required root or sudo privileges.

Server clock, gears and terminal window depicting a cron job: scheduled, recurring automated tasks on a Unix-like system that run scripts or commands at specified times. every day.

Graphic showing safe Linux shutdown steps: save work, close apps, run sudo shutdown or poweroff, notify users, unmount drives, wait for clean shutdown before powering off hardware.

Illustration of systemctl controlling systemd units: start, stop, restart, enable, disable, mask, status queries, list units, dependencies, and change boot targets or system state.

Screenshot of a Linux terminal showing commands and outputs for checking system uptime: uptime, who -b, cat /proc/uptime, systemctl status, systemd-analyze, and top's uptime line..