Merge pull request #507 from sbrl/patch-1

Add apt-cache

pages/linux/apt-cache.md

@@ -0,0 +1,15 @@
+# apt-cache
+
+> Debian and Ubuntu package query tool
+
+ - Search for a package in your current sources
+
+`apt-cache search {{query}}`
+
+ - Show information about a package
+
+`apt-cache show {{package}}`
+
+ - Show whether a package is installed and up to date
+ 
+`apt-cache policy {{package}}`