Update cheatsheets

tldr/linux/opkg

@@ -31,3 +31,11 @@ source: https://github.com/tldr-pages/tldr.git
 - List all the available packages:
 
 `opkg list`
+
+- Find out which package owns a file:
+
+`opkg search {{/path/to/file}}`
+
+- List all files belonging to a package:
+
+`opkg files {{package}}`

tldr/stty

@@ -23,3 +23,11 @@ source: https://github.com/tldr-pages/tldr.git
 - Reset all modes to reasonable values for the current terminal:
 
 `stty sane`
+
+- Switch between raw and normal mode:
+
+`stty {{raw|cooked}}`
+
+- Turn character echoing off or on:
+
+`stty {{-echo|echo}}`