diff --git a/app/daemon.go b/app/daemon.go
index b66a4a5..caccbb1 100644
--- a/app/daemon.go
+++ b/app/daemon.go
@@ -42,8 +42,17 @@ func cmdStdout(commandline []string) chan *string {
 func runCommands(commands [][]string, moment string) {
 	for _, command := range commands {
 		cmd := exec.Command(command[0], command[1:]...)
+		cmd.WaitDelay = time.Minute
+
+		logger.Printf(logger.INFO, "%v command: run %v\n", moment, command)
+
 		if err := cmd.Start(); err != nil {
-			logger.Printf(logger.ERROR, "couldn't execute %v command: %v", moment, err)
+			logger.Printf(logger.ERROR, "%v command: run %v: %v", moment, command, err)
+		} else {
+			err := cmd.Wait()
+			if err != nil {
+				logger.Printf(logger.ERROR, "%v command: run %v: %v", moment, command, err)
+			}
 		}
 	}
 }
diff --git a/app/main.go b/app/main.go
index 30ec348..ba4c437 100644
--- a/app/main.go
+++ b/app/main.go
@@ -115,7 +115,7 @@ var exampleConf string
 
 func Main() {
 	if len(os.Args) <= 1 {
-		logger.Fatalln("No argument provided")
+		logger.Fatalln("No argument provided. Try `reaction help`")
 		basicUsage()
 		os.Exit(1)
 	} else if os.Args[1] == "-h" || os.Args[1] == "--help" {
diff --git a/app/startup.go b/app/startup.go
index 8435f25..3a3436f 100644
--- a/app/startup.go
+++ b/app/startup.go
@@ -45,11 +45,11 @@ func (c *Conf) setup() {
 		stream.name = streamName
 
 		if strings.Contains(stream.name, ".") {
-			logger.Fatalln("Bad configuration: character '.' is not allowed in stream names", stream.name)
+			logger.Fatalf("Bad configuration: character '.' is not allowed in stream names: '%v'", stream.name)
 		}
 
 		if len(stream.Filters) == 0 {
-			logger.Fatalln("Bad configuration: no filters configured in", stream.name)
+			logger.Fatalf("Bad configuration: no filters configured in %v", stream.name)
 		}
 		for filterName := range stream.Filters {
 
@@ -58,23 +58,23 @@ func (c *Conf) setup() {
 			filter.name = filterName
 
 			if strings.Contains(filter.name, ".") {
-				logger.Fatalln("Bad configuration: character '.' is not allowed in filter names", filter.name)
+				logger.Fatalf("Bad configuration: character '.' is not allowed in filter names: '%v'", filter.name)
 			}
 			// Parse Duration
 			if filter.RetryPeriod == "" {
 				if filter.Retry > 1 {
-					logger.Fatalln("Bad configuration: retry but no retryduration in", stream.name, ".", filter.name)
+					logger.Fatalf("Bad configuration: retry but no retryperiod in %v.%v", stream.name, filter.name)
 				}
 			} else {
 				retryDuration, err := time.ParseDuration(filter.RetryPeriod)
 				if err != nil {
-					logger.Fatalln("Bad configuration: Failed to parse retry time in", stream.name, ".", filter.name, ":", err)
+					logger.Fatalf("Bad configuration: Failed to parse retry time in %v.%v: %v", stream.name, filter.name, err)
 				}
 				filter.retryDuration = retryDuration
 			}
 
 			if len(filter.Regex) == 0 {
-				logger.Fatalln("Bad configuration: no regexes configured in", stream.name, ".", filter.name)
+				logger.Fatalf("Bad configuration: no regexes configured in %v.%v", stream.name, filter.name)
 			}
 			// Compute Regexes
 			// Look for Patterns inside Regexes
@@ -140,16 +140,21 @@ func parseConf(filename string) *Conf {
 
 	var conf Conf
 	if filename[len(filename)-4:] == ".yml" || filename[len(filename)-5:] == ".yaml" {
+		logger.Println(logger.DEBUG, "yaml")
 		err = jsonnet.NewYAMLToJSONDecoder(data).Decode(&conf)
+		if err != nil {
+			logger.Fatalln("Failed to parse yaml configuration file:", err)
+		}
 	} else {
+		logger.Println(logger.DEBUG, "json")
 		var jsondata string
 		jsondata, err = jsonnet.MakeVM().EvaluateFile(filename)
 		if err == nil {
 			err = json.Unmarshal([]byte(jsondata), &conf)
 		}
-	}
-	if err != nil {
-		logger.Fatalln("Failed to parse configuration file:", err)
+		if err != nil {
+			logger.Fatalln("Failed to parse json configuration file:", err)
+		}
 	}
 
 	conf.setup()
diff --git a/config/test.jsonnet b/config/test.jsonnet
index 61b51c7..c3ccf97 100644
--- a/config/test.jsonnet
+++ b/config/test.jsonnet
@@ -5,6 +5,17 @@
     },
   },
 
+  start: [
+    ['err'],
+    ['sleep', '10'],
+  ],
+
+  stop: [
+    ['sleep', '1'],
+    ['false'],
+    ['true'],
+  ],
+
   streams: {
     tailDown1: {
       cmd: ['sh', '-c', "echo 1 2 3 4 5 1 2 3 4 5 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 | tr ' ' '\n' | while read i; do sleep 2; echo found $(($i % 10)); done"],