Added dpkg notes to the knowledge base

knowledge base/linux/debian linux.md

@@ -3,8 +3,10 @@
 ## Further readings
 
 - The [APT] package manager
+- [Dpkg]
 - [Advice for new users on not breaking their Debian system]
 
 [apt]: apt.md
+[dpkg]: dpkg.md
 
 [advice for new users on not breaking their debian system]: https://wiki.debian.org/DontBreakDebian

knowledge base/linux/dkpg.md

@@ -0,0 +1,27 @@
+# Dpkg
+
+## TL;DR
+
+```shell
+# add an extra architecture
+dpkg --add-architecture i386
+
+# list extra architectures
+dpkg --print-foreign-architectures
+
+# list available extra architectures
+dpkg-architecture --list-known
+
+#list all installed packages of the i386 architecture
+dpkg --get-selections | grep i386 | awk '{print $1}'
+
+# remove the i386 architecture
+apt-get purge $(dpkg --get-selections | grep --color=never i386 | awk '{print $1}')
+dpkg --remove-architecture i386
+```
+
+## Further readings
+
+- [How to check if dpkg-architecture --list has all the architectures?]
+
+[how to check if dpkg-architecture --list has all the architectures?]: https://askubuntu.com/questions/852115/how-to-check-if-dpkg-architecture-list-has-all-the-architectures#852120