From cae2ec4a2845300dbe920817c5a1bce3fcc342b5 Mon Sep 17 00:00:00 2001
From: Michele Cereda <cereda.michele@gmail.com>
Date: Sun, 17 Apr 2022 20:12:37 +0200
Subject: [PATCH] Added apt notes to the knowledge base

---
 knowledge base/linux/README.md |  3 +++
 knowledge base/linux/apt.md    | 19 +++++++++++++++++++
 2 files changed, 22 insertions(+)
 create mode 100644 knowledge base/linux/README.md
 create mode 100644 knowledge base/linux/apt.md

diff --git a/knowledge base/linux/README.md b/knowledge base/linux/README.md
new file mode 100644
index 0000000..b93bd05
--- /dev/null
+++ b/knowledge base/linux/README.md	
@@ -0,0 +1,3 @@
+# Linux-releated knowledge base
+
+The documents contained here can only (or mostly) be used on GNU/Linux systems.
diff --git a/knowledge base/linux/apt.md b/knowledge base/linux/apt.md
new file mode 100644
index 0000000..9d589bf
--- /dev/null
+++ b/knowledge base/linux/apt.md	
@@ -0,0 +1,19 @@
+# The APT package manager
+
+## TL;DR
+
+```shell
+# mark all packages as non-explicitly installed
+apt-mark auto $(sudo apt-mark showmanual)
+
+# remove orphaned packages
+apt autoremove --purge
+```
+
+## Further readings
+
+- [Apt configuration]
+- [Configuring Apt sources]
+
+[apt configuration]: https://wiki.debian.org/AptConfiguration
+[configuring apt sources]: https://wiki.debian.org/SourcesList