Bücher von Richard Petersen

This book covers the Ubuntu 18.04 LTS (Bionic Beaver) release, focusing on applications and administrative tools. The emphasis here is on what users will face when using Ubuntu, covering topics like installation, applications, software management, the Ubuntu desktops (GNOME and KDE), shell commands, network connections, and system administration tasks. There are four parts: Getting Started, Applications, Desktops, and Administration. Part 1 focuses on getting started, covering Ubuntu information and resources, using Ubuntu Live DVD/USB discs, installing and setting up Ubuntu, upgrading Ubuntu, basic use of the desktop interface, and connecting to wired and wireless networks. Ubuntu Software and Synaptic Package manager, which provides easy and effective software management, are both discussed. Part 2 keys in on office, multimedia, mail, Internet, and social media applications. Part 3 covers the Ubuntu, Kubuntu, Ubuntu MATE, Ubuntu Cinnamon, Xubuntu, and Lubuntu desktops. as well as the BASH shell. The Ubuntu desktop with the GNOME interface is examined in detail. Ubuntu GNOME uses a Dock and a Dash (dashboard) to manage access to applications and devices. Part 4 deals with administration topics, first discussing system tools like the GNOME system monitor, the Disk Usage Analyzer, and Disk Utility (Udisks). Then a detailed chapter on Ubuntu system administration tools is presented, covering tasks such as managing users and file systems, Bluetooth setup, network folder sharing, backups, and printing. The network connections chapter covers a variety of network tasks, including manual configuration of wired and wireless connections, and firewalls (the Gufw and FirewallD).

C differs from most programming languages in its use of expressions, pointers, and arrays. For those learning C, pointers are the greatest source of confusion. The primary aim of this text is to provide working models of how pointers are used in C as well as an introduction to their use in C++. Most beginners falter on the use of pointers. Many try to avoid pointers completely, but quickly find that pointers are used extensively throughout C programs. Some attain a partial understanding of pointers which, at first, gets them by. However, when faced with complex programming tasks, they find that pointers become a necessity. In most programming languages one learns about pointers only after most other topics have been discussed. Pointers are just one more added feature of the language. In C and in C++, however, pointers are used with every feature. There are pointers to variables, pointers as parameters, pointers as arrays, pointers to structures, and even pointers to pointers. With each feature pointers are used differently. The way pointers work with variables is very different from the way pointers work with arrays. In this text, you learn pointers as you learn each feature of the language. With variables, you learn pointers to variables; with parameters, pointers to parameters; with functions: pointers to functions; with arrays, pointers in arrays; with structures, pointers to structures. In addition, for C++ you will learn pointers to objects, to class members, and derived objects. Such an approach provides an understanding of the many different ways pointers are used throughout the language. The text is arranged in five sections. The first section focuses on the basic structure of the language. Variables, functions, and expressions are carefully examined. The second section deals with arrays. Arrays form an exception in C. Unlike structures they are not data objects. They are completely managed by pointers. The third section describes data structures and file management. The chapter on data structures introduces basic concepts such as linked lists and trees. A special examination is made of recursion and how it operates with lists, trees, and b-trees. The chapters on file management discuss the different types of files with special emphasis on record files b-tree indexes. The fourth section provides an introduction to C++, covering classes and objects, their use with pointers, as well as operator overloading and inheritance. The fifth section covers additional topics greater detail such as the pre-processor and bitwise operations.

This book is designed as an Ubuntu 22.04 LTS Server administration and reference source, covering the Ubuntu servers and their support applications. Server tools are covered as well as the underlying configuration files and system implementations. The emphasis is on what administrators will need to know to perform key server support and management tasks. Coverage of the systemd service management system is integrated into the book. Topics covered include software management, systemd service management, AppArmor security, OpenSSH, the Chrony time server, and Ubuntu cloud services. Key servers are examined, including Web, FTP, CUPS printing, NFS, and Samba Windows shares. Network support servers and applications covered include the Squid proxy server, the Domain Name System (BIND) server, DHCP, distributed network file systems, nftables firewalls, and cloud computing.The book is organized into five parts: getting started, services, shared resources, network support, and shells.Part 1 focuses on basic tasks such as installing the Ubuntu Live Server, configuring networking with Netplan, systemd-networkd, and NetworkManager, managing software from the Ubuntu Snap and APT repositories, and basic usage for the desktop and the command line interfaces. Part 2 examines Internet servers as well as how services are managed by systemd using unit files. Configuration and implementation of the Postfix mail server, the vsftpd FTP server, the Apache Web server, as well as news and database servers are covered in detail.Part 3 deals with servers that provide shared resources on a local network or the Internet. Services examined include the CUPS printing server, NFS Linux network file server, and Samba Windows file and printing server, clustering, and cloud computing services supported by Ubuntu.Part 4 covers servers that provide network support, like the Squid proxy server, the Bind Domain Name System (DNS) server, DHCP servers, and the nftables firewall along with the configuration firewall tools FirewallD and UFW. Key networking operations are also examined like IPv6 auto-configuration, TPC/IP networking, and network monitoring tools.Part 5 provides a review of shell commands, including those used for managing files, as well as shell scripts, variables, and configuration files. The Ubuntu Live Server only installs a command line interface, with no desktop. To manage your system and its files you will have to know the shell commands.

This book covers the Ubuntu 22.04 LTS (Jammy Jellyfish) release, focusing on applications and administrative tools. The emphasis here is on what users will face when using Ubuntu, covering topics like installation, applications, software management for Snap and APT, the Ubuntu desktops (GNOME, MATE, and KDE), shell commands, network connections, and system administration tasks. There are four parts: Getting Started, Applications, Desktops, and Administration. Part 1 focuses on getting started, covering Ubuntu information and resources, using the Ubuntu Live DVD/USB drive, installing and setting up Ubuntu, upgrading Ubuntu, basic use of the desktop interface, and connecting to wired and wireless networks. Repositories and their use are covered in detail, along with the new Snap system for managing Snap packages. Ubuntu Snap package management with Ubuntu Software, the snap command, the Snap Store are examined, as well as APT package management with Gnome Software, the Synaptic Package Manager, and the apt and apt-get commands.Part 2 keys in on office, multimedia, mail, Internet, and social media applications. Part 3 covers the Ubuntu, Kubuntu, Ubuntu MATE, Xubuntu, and Lubuntu desktops. as well as the BASH shell. The Ubuntu desktop, which uses GNOME, is examined in detail. Part 4 deals with administration topics, first discussing system tools like the GNOME system monitor, the Disk Usage Analyzer, Seahorse, and Disk Utility. Then a detailed chapter on Ubuntu system administration tools is presented, covering tasks such as managing users and file systems, Bluetooth setup, network folder sharing, backups, and printing. The network connections chapter covers a variety of network tasks, including manual configuration of wired and wireless connections, and firewalls.

This book is designed as an Ubuntu 18.04 LTS Server administration and reference source, covering the Ubuntu servers and their support applications. Server tools are covered as well as the underlying configuration files and system implementations. The emphasis is on what administrators will need to know to perform key server support and management tasks. Coverage of the systemd service management system is integrated into the book. Topics covered include software management, systemd service management, systemd-networkd and Netplan network configuration, AppArmor security, OpenSSH, the Chrony time server, and Ubuntu cloud services. Key servers are examined, including Web, FTP, CUPS printing, NFS, and Samba Windows shares. Network support servers and applications covered include the Squid proxy server, the Domain Name System (BIND) server, DHCP, distributed network file systems, IPtables firewalls, and cloud computing. The book is organized into five parts: getting started, services, shared resources, network support, and shells.