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"sudo apt autoremove" - Remove Unneeded Packages
This section provides a tutorial example on how to use the 'apt autoremove' command to remove all packages that are no longer needed on Ubuntu computer.
2025-12-29, ∼162🔥, 0💬

"ps -o rss,drs,trs,vsz,sz" - Process Status Options
This section provides a tutorial on how to 'ps -o rss,drs,trs,vsz,sz' command to report memory usage of each running process.
2025-12-29, ∼147🔥, 0💬

Bash Command Line Interpretation Steps
This section describes major processing steps, when a command line is entered at the Bash shell prompt.
2025-12-29, ∼154🔥, 0💬

GNOME Application - Terminal
This section provides a tutorial example on how to use the GNOME application 'Terminal' to run commands interactively.
2025-12-29, ∼144🔥, 0💬

Verify Cache Memory with "cp" Command
This section provides a tutorial example to verify the cache memory usage in the RAM free space using a single 'cp' command.
2025-12-29, ∼148🔥, 0💬

"traceroute" - Trace Route to Remote Host
This section provides a tutorial example on how to use 'traceroute' command to trace route (or gateways) between the local host and a given remote host.
2025-12-29, ∼154🔥, 0💬

"rar" and "unrar" - Roshal Archive Files
This section provides a tutorial example on how to use 'unrar' package to extract files from a RAR archive file.
2025-12-29, ∼143🔥, 0💬

Command Input/Output Redirection
This section provides a tutorial example on how to use command input and output redirection operators to read input files and save output files.
2025-12-29, ∼154🔥, 0💬

Network Connection on Ubuntu
This chapter provides introductions and tutorial on network connection and tools. Topics include introduction of Wi-Fi connection; 'ping' and 'traceroute' to check connectivity; 'ifconfig' to view current network configuration; 'netstat' as network activity monitor.
2025-12-29, ∼142🔥, 0💬

"netstat" - Display Network Statistics
This section provides a tutorial example on how to use 'netstat' command to display network statistics
2025-12-29, ∼146🔥, 0💬

gnome-tweaks - The GNOME Tweak Tool
This section provides a tuturial example on how to install 'gnome-tweaks' to customize touchpad to simulate mouse clicks.
2025-12-29, ∼158🔥, 0💬

SSH Protocol and ssh/scp Commands
This chapter provides introductions and tutorial notes on SSH (Secure SHell) protocol and 'ssh/scp' commands. Topics include SSH connection steps; user password and public key authentication methods; SSH server configuration settings; 'ssh' for remote login sessions; 'scp' for copying remote files.
2025-12-29, ∼156🔥, 0💬

Connect to Wi-Fi with GNOME Settings
This section provides a tutorial example on how to use GNOME Settings to connect to Wi-Fi service.
2025-12-29, ∼162🔥, 0💬

"systemctl status/start/stop/enable/disable" Commands
This section provides a quick introduction of the 'systemctl' command, which allows you to start or stop a system service, check the status of a service, and enable or disable a service at the boot time.
2025-12-29, ∼187🔥, 0💬

Keyboard Shortcuts on GNOME
This section lists commonly used keyboard shortcuts on GNOME on Ubuntu computers. Alt-PrtSc-S.U.B forces the system to reboot.
2025-12-29, ∼150🔥, 0💬

"more", "head" and "cat" - Read Files
This section provides a tutorial example on how to use 'more', 'head' or 'tail' commands to read text files one screen at a time, to read the first 10 lines, or to read the last 10 lines.
2025-12-29, ∼140🔥, 0💬

GNOME - Desktop Interface and Environment
This chapter provides introductions and tutorial examples on GNOME, which is the default desktop interface and environment on Ubuntu computers. Topics include introduction of GNOME; keyboard shortcuts; gnome-tweaks package; main applications: Settings, Files and Terminal; image viewers; video player...
2025-12-29, ∼152🔥, 0💬

"route" - Manage Routing Table
This section provides a tutorial example on how to use 'route' command to view and update the routing table for network traffic.
2025-12-29, ∼154🔥, 0💬

"ifconfig" - Trace Routes to Remote Host
This section provides a tutorial example on how to use 'ifconfig' command to view and manage network interface configurations.
2025-12-29, ∼151🔥, 0💬

"last/lastb" - Review Login History
This section provides a quick introduction of the 'last' and 'lastb' commands, which allows you to review login history and login attempts.
2025-12-29, ∼137🔥, 0💬

"who | w" - Logged-in Users and Their Running Commands
This section provides a tutorial example on how to display logged-in users and their running commands using 'who' and 'w' commands on Ubuntu systems.
2025-12-29, ∼156🔥, 0💬

hostnamectl - Display System Information
This section provides a tutorial example on how to display operating system information using the 'uname' and other commands on Ubuntu systems.
2025-12-29, ∼152🔥, 0💬

What Is Swap Space
This section describes swap space, reserved area on the hard disk that extends RAM to form a larger physical memory.
2025-12-29, ∼150🔥, 0💬

Cron Daemon, Table and Jobs
This section describes what is cron daemon and its related cron tables/jobs.
2025-12-29, ∼149🔥, 0💬

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