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Create and Run Bash Script
This section provides a tutorial example on how to create and run a Bash shell script file.
2025-12-29, ∼110🔥, 0💬

"tmux" - Terminal Multiplexer
This section provides a tutorial example on how to use 'tmux' tool to manage multiple shells as windows and panes in a single terminal. 'tmux' automatically keeps all shells running when the terminal is disconnected.
2025-12-29, ∼108🔥, 0💬

"cURL" - Client for URL
This section provides a tutorial example on how to use 'cURL' command to send requests to a remote server in different protocols in URL format.
2025-12-29, ∼110🔥, 0💬

"wget" - Get Files from the Web
This section provides a tutorial example on how to use 'wget' command to download files from the Web. 'wget' can resume failed downloads.
2025-12-29, ∼113🔥, 0💬

earlyoom - A Simple OOM Killer
This section provides a tutorial example on how to install 'earlyoom' to prevent OOM (Out Of Memory) freeze.
2025-12-29, ∼110🔥, 0💬

Memory Management
This chapter provides introductions and tutorial notes on memory management. Topics include memory layers and access speed; cache memory levels; virtual memory and physical memory mapping; page table; buffers, caches and swap spaces; memory usage reporting tools: free, ps, smem, pmap, /proc/meminfo,...
2025-12-29, ∼109🔥, 0💬

"compress/uncompress" - Compressed *.Z Files
This section provides a tutorial example on how to use 'compress' and 'uncompress' commands to compress large files and restore them later. Compressed files will have the *.Z file name extension.
2025-12-29, ∼108🔥, 0💬

References
List of reference materials used in this book.
2025-12-29, ∼108🔥, 0💬

Move All Users to a New System
This section provides a tutorial example on how to move all users to a new Ubuntu system.
2025-12-29, ∼111🔥, 0💬

Move /home Directory to New Partition
This section provides a tutorial example on how to move /home directory to a new partition when it runs out of space. A better solution is to extend its file system.
2025-12-29, ∼110🔥, 0💬

Virtual Memory vs. Physical Memory
This section describes virtual memory, which is mapped to physical memory through MMU (Memory Management Unit).
2025-12-29, ∼109🔥, 0💬

Virtual Memory Mapping and Page Table
This section describes virtual memory page, physical memory frame, and page table that maps a page to a frame.
2025-12-29, ∼108🔥, 0💬

"sudo apt install/remove" - Install/Remove Package
This section provides a tutorial example on how to use the 'apt install/remove' command to install or remove a given software package.
2025-12-29, ∼112🔥, 0💬

"split" and "cat" - Split and Join Files
This section provides a tutorial example on how to use 'split' command to split it into chunks and use 'cat' command to join chunks back into a single file.
2025-12-29, ∼109🔥, 0💬

"gzip/gunzip" - Compressed *.gz Files
This section provides a tutorial example on how to use 'gzip' and 'gunzip' commands to compress large files and restore them later. Compressed files will have the *.gz file name extension.
2025-12-29, ∼115🔥, 0💬

"ps" - Display Current Processes
This section provides a tutorial example on how to use 'ps' command to display current process on the system.
2025-12-29, ∼109🔥, 0💬

pmap - Process Memory Map
This section provides a tutorial on how to install 'smem' and use it to report memory usage of each running process.
2025-12-29, ∼108🔥, 0💬

Process Management
This chapter provides introductions and tutorial on managing processes on Ubuntu systems. Topics include 'ps' to display processes; 'jobs' and other commands to manage background jobs.
2025-12-29, ∼109🔥, 0💬

APT Configuration Settings and Overrides
This section provides a quick introduction of APT (Advanced Package Tool) configuration settings and overriding configuration files.
2025-12-29, ∼116🔥, 0💬

"zip" and "unzip" - Create and Extract ZIP Files
This section provides a tutorial example on how to use 'zip' command to compress multiple file and sub-directories into a ZIP file and use 'unzip' command to extract files out of a ZIP file.
2025-12-29, ∼109🔥, 0💬

"lsof" - List of Open Files
This section provides a tutorial example on how to use 'lsof' command to display network connections as open files
2025-12-29, ∼113🔥, 0💬

GNOME Application - Image Viewers
This section introduces 3 basic image/picture viewers for GNOME desktop. gThumb seems to be a nice image browser with enough basic editing functions.
2025-12-29, ∼109🔥, 0💬

What Is GNOME
This section provides a quick introduction of GNOME, an open-source desktop environment needed to run graphical applications like Firefox to browse the Internet.
2025-12-29, ∼109🔥, 0💬

What Is Bash (Bourne Again SHell)
This section provides a quick introduction of Bash shell created by Brian Fox in 1989.
2025-12-29, ∼111🔥, 0💬

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