diff --git a/flake.nix b/flake.nix
index 01542a2..5ef6ea1 100644
--- a/flake.nix
+++ b/flake.nix
@@ -15,7 +15,7 @@
         in {
           tsvnstat = pkgs.buildGoModule {
             pname = "tsvnstat";
-            version = "v0.0.4";
+            version = "v0.0.5";
             src = ./.;
 
             vendorSha256 = "sha256-RNhu1gQ62Hg8Fhiw9uIS+b4YaAHtZMaqbelMKv+oZjM=";
diff --git a/generate_images.sh b/generate_images.sh
index cbd550b..fb67042 100755
--- a/generate_images.sh
+++ b/generate_images.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env sh
 
+set -x
+
 for i in $@; do
 	vnstati --style 1 -L -s -o ${i}-s.png $i
 	vnstati --style 1 -L --fivegraph 576 218 -o ${i}-5g.png $i
diff --git a/main.go b/main.go
index 1b09f11..7e8b4c7 100644
--- a/main.go
+++ b/main.go
@@ -52,6 +52,7 @@ func main() {
 	name := flag.String("name", "", "name of service")
 	dir := flag.String("dir", tmpDir, "directory containing vnstat images")
 	key := flag.String("key", "", "path to file containing the api key")
+	shell := flag.String("sh", "/bin/sh", "path to interpreter")
 	flag.Parse()
 
 	s := &tsnet.Server{
@@ -79,7 +80,6 @@ func main() {
 
 	go func() {
 		for {
-			time.Sleep(10 * time.Second)
 			log.Printf("running %q in %q", tmpFile.Name(), tmpDir)
 
 			ifaces, err := net.Interfaces()
@@ -87,12 +87,12 @@ func main() {
 				log.Fatal("can't get interfaces...", err)
 			}
 
-			var ifNames []string
+			cmd := []string{tmpFile.Name()}
 			for _, intf := range ifaces {
-				ifNames = append(ifNames, intf.Name)
+				cmd = append(cmd, intf.Name)
 			}
 
-			genCmd := exec.Command(tmpFile.Name(), ifNames...)
+			genCmd := exec.Command(*shell, cmd...)
 			genCmd.Dir = *dir
 			out, err := genCmd.Output()
 			if err != nil {