20151102 - Adding a cheatsheet for at (apt vs apt-get)

cheat/cheatsheets/apt

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+# Desc: Allows to update the operating system
+
+# To fetch package list:
+apt update
+
+# To download and install updates without installing new package:
+apt upgrade
+
+# To download and install the updates AND install new necessary packages:
+apt dist-upgrade
+
+# Full command:
+apt update && apt dist-upgrade
+
+# To install a new package(s):
+apt install package(s)