Add instructions for Keyboard-Shortcut launch in Ubuntu

README.md

@@ -6,6 +6,7 @@ Quickly find and open a pdf among a collection of thousands of unsorted pdfs thr
 - [Installation on OSX](#installation-on-osx-with-homebrew)
 - [Usage](#usage)
 - [How to clear the cache?](#how-to-clear-the-cache)
+- [Launch with keyboard shortcut in Ubuntu](#launch-with-keyboard-shortcut-in-ubuntu)
 - [See it in action](#see-it-in-action)
 - [Is the historical bash code still available?](#is-the-historical-bash-code-still-available)
 
@@ -95,6 +96,22 @@ To clear the cache (which contains text extracted from PDF), you may safely remo
 ``~/.cache/fast-p-pdftotext-output/fast-p_cached_pdftotext_output.db``, or  
 ``~/.cache/fast-p_cached_pdftotext_output.db`` in older version.
 
+# Launch with keyboard shortcut in Ubuntu
+
+On Ubuntu desktop (tested in 18.04), one may add a keyboard shortcut to launch a new terminal running the ``p`` command right away.
+With the following script, the new terminal window will automatically close after choosing a PDF.
+
+Create a file ``~/.fast-p-rc`` with
+```
+source .bashrc
+p;
+sleep 0.15; exit;
+```
+and in Ubuntu Settings/Keyboard, add a custom shortcut that runs the command
+``gnome-terminal -- sh -c "bash --rcfile .fast-p-rc"``.
+
+
+
 # See it in action
 
 ![illustration of the p command](https://user-images.githubusercontent.com/1019692/34446795-12229072-ecac-11e7-856a-ec0df0de60ae.gif)