Book Image

Learn Linux Quickly

By : Ahmed AlKabary
Book Image

Learn Linux Quickly

By: Ahmed AlKabary

Overview of this book

Linux is one of the most sought-after skills in the IT industry, with jobs involving Linux being increasingly in demand. Linux is by far the most popular operating system deployed in both public and private clouds; it is the processing power behind the majority of IoT and embedded devices. Do you use a mobile device that runs on Android? Even Android is a Linux distribution. This Linux book is a practical guide that lets you explore the power of the Linux command-line interface. Starting with the history of Linux, you'll quickly progress to the Linux filesystem hierarchy and learn a variety of basic Linux commands. You'll then understand how to make use of the extensive Linux documentation and help tools. The book shows you how to manage users and groups and takes you through the process of installing and managing software on Linux systems. As you advance, you'll discover how you can interact with Linux processes and troubleshoot network problems before learning the art of writing bash scripts and automating administrative tasks with Cron jobs. In addition to this, you'll get to create your own Linux commands and analyze various disk management techniques. By the end of this book, you'll have gained the Linux skills required to become an efficient Linux system administrator and be able to manage and work productively on Linux systems.
Table of Contents (24 chapters)

Listing all packages

You can use the dpkg -l command to list all the packages that are installed on your system:

root@ubuntu-linux:~# dpkg -l

You can also use the apt-cache pkgnames command to list all the packages that are available for you to install:

root@ubuntu-linux:~# apt-cache pkgnames 
libdatrie-doc

libfstrcmp0-dbg
libghc-monadplus-doc
librime-data-sampheng
python-pyao-dbg
fonts-georgewilliams

python3-aptdaemon.test
libcollada2gltfconvert-dev
python3-doc8

r-bioc-hypergraph
.
.
.
.
.

You can pipe the output to the wc -l command to get the total number of available packages:

root@ubuntu-linux:~# apt-cache pkgnames | wc -l 64142

Wow! That’s a massive number; over 64,000 available packages on my system.

You may also be interested to know which repositories (sources) your system used to obtain all these packages. These repositories are included in the file /etc/ap- t/sources.list and in any file with the suffix .list under the directory /etc/apt/- sources.list.d/. You can check the man...