diff --git a/pidcat.py b/pidcat.py
index f5911cf..b430d6f 100755
--- a/pidcat.py
+++ b/pidcat.py
@@ -45,6 +45,7 @@ parser.add_argument('-c', '--clear', dest='clear_logcat', action='store_true', h
 parser.add_argument('-t', '--tag', dest='tag', action='append', help='Filter output by specified tag(s)')
 parser.add_argument('-i', '--ignore-tag', dest='ignored_tag', action='append', help='Filter output by ignoring specified tag(s)')
 parser.add_argument('-v', '--version', action='version', version='%(prog)s ' + __version__, help='Print the version number and exit')
+parser.add_argument('-a', '--all', dest='all', action='store_true', default=False, help='Print all log messages')
 
 args = parser.parse_args()
 min_level = LOG_LEVELS_MAP[args.min_level.upper()]
@@ -65,6 +66,9 @@ if args.current_app:
   running_package_name = re.search(".*TaskRecord.*A[= ]([^ ^}]*)", system_dump).group(1)
   package.append(running_package_name)
 
+if len(package) == 0:
+  args.all = True
+
 # Store the names of packages for which to match all processes.
 catchall_package = filter(lambda package: package.find(":") == -1, package)
 # Store the name of processes to match exactly.
@@ -318,7 +322,7 @@ while adb.poll() is None:
       message = message.lstrip()
       owner = app_pid
 
-  if owner not in pids:
+  if not args.all and owner not in pids:
     continue
   if level in LOG_LEVELS_MAP and LOG_LEVELS_MAP[level] < min_level:
     continue