Add a shell command example.

examples/shell.py

@@ -0,0 +1,25 @@
+#!/usr/bin/env python
+# coding=utf-8
+import subprocess
+
+from qutescript import userscript
+from qutescript.cli import parser
+
+parser.add_argument('-c',
+                    action='store',
+                    help='Command to execute.',
+                    default='')
+
+
+@userscript
+def shell_command(request):
+    args = parser.parse_args()
+    if not args.c:
+        request.send_text("Please specify a command: {} -c'uname -a' ".format(request.script_name))
+        return
+    r = subprocess.check_output(args=args.c.split(' '))
+    request.send_text(r)
+
+
+if __name__ == '__main__':
+    shell_command()