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+%title: a crash course on handling deb packages
+%author: jesse portnoy <jesse@packman.io>
+%date: 2023-07-11
+
+----------------------------------------------------------------------------
+
+## topics covered in this course
+
+- what is a `deb` package? 
+- what is dpkg? 
+- what is apt? 
+- the `apt` util
+- `apt-get`
+- `apt-cache`
+- `apt-file`
+- fetching and installing packages
+- install vs. upgrade
+- non-interactive operations
+- a note on dependencies
+- package dependencies & relationships
+- querying the local packages db
+- querying remote repos
+- configuration operations
+- downloading & building packages from source
+- automating the installation of packages that require inputs
+- removing packages
+- thanks & final note
+
+```c
+#include <stdio.h>
+int main()
+{
+    return 0;
+}
+```
+
+```php
+<?php
+phpinfo();
+echo "Hello World\n";
+var 7 = 1;
+?>
+```
+
+----------------------------------------------------------------------------
+
+## What is a `deb` package? 
+
+*deb* is the format, as well as filename extension of the software package format for the Debian Linux distribution 
+and its derivatives. Debian packages are standard UNIX *ar* archives that include two tar archives. 
+One archive holds the control information and another contains the installable data.
+
+## What is dpkg? 
+
+*dpkg* is a tool to install, build, remove and manage Debian packages. 
+
+*dpkg* is controlled entirely via command line parameters, which consist of exactly one action and zero or more options. 
+The action parameter tells *dpkg* what to do and options control the behavior of the action in some way. 
+
+*dpkg* maintains some usable information about available packages. The information is divided in three classes: states, 
+selection states and flags. 
+
+## What is APT? 
+
+Advanced Package Tool, or APT, is a free-software user interface that works with core libraries to handle the installation 
+and removal of software on Debian, and Debian-based Linux distributions. APT simplifies the process of managing software by 
+automating the retrieval, configuration and installation of software packages.
+
+In the next slide, we'll review some important APT utils and their respective functionality.