diff --git a/autoattach b/autoattach
index 9179920..718f2e2 100755
--- a/autoattach
+++ b/autoattach
@@ -14,12 +14,26 @@ function write_setting
     fi
 }
 
+function is_tmux_running
+{
+  if [ -n "${TMUX}" ]; then
+		return 0
+	fi
+  return 1
+}
+
+function debug
+{
+  if ! is_tmux_running; then
+    echo $1
+  fi
+}
 
 function attach_session
 {
-	if [ -n "${TMUX}" ]; then
-		exit 1
-	fi
+  if is_tmux_running; then
+    exit 0
+  fi
 
 	tmux attach -t $1 2> /dev/null
 
@@ -61,7 +75,6 @@ function usage
 	exit 0
 }
 
-
 # Load configuration file
 test -f $CONF_FILE && . $CONF_FILE
 
@@ -70,8 +83,8 @@ PLATFORM='unknown'
 unamestr=$(uname)
 case "$unamestr" in
 	OpenBSD* )
-		echo "*BSD OS detected!!"
-		echo "Long options is disabled!!"
+		debug "*BSD OS detected!!"
+		debug "Long options is disabled!!"
 		OPTS=`getopt	chgs: $*`
 		set_opts_exit_status=$?
 		PLATFORM=$unamestr ;;