diff --git a/cmd/cmd.go b/cmd/cmd.go
index 423428e..3ab3a76 100644
--- a/cmd/cmd.go
+++ b/cmd/cmd.go
@@ -7,10 +7,9 @@ import (
 
 	"github.com/go-flucky/flucky/cmd/compression"
 	"github.com/go-flucky/flucky/cmd/convert"
-	"github.com/go-flucky/flucky/cmd/pressure"
-
 	"github.com/go-flucky/flucky/cmd/daemon"
 	"github.com/go-flucky/flucky/cmd/humidity"
+	"github.com/go-flucky/flucky/cmd/pressure"
 	"github.com/go-flucky/flucky/cmd/rgbled"
 	"github.com/go-flucky/flucky/cmd/sensor"
 	"github.com/go-flucky/flucky/cmd/temperature"
@@ -60,13 +59,13 @@ func Execute(version string) {
 
 	rootCmd.PersistentFlags().StringVar(&configFile, "config", "/etc/flucky/config.json", "Config file")
 
-	compression.InitCmd(rootCmd, configFile)
-	convert.InitCmd(rootCmd, configFile)
-	daemon.InitCmd(rootCmd, configFile)
-	humidity.InitCmd(rootCmd, configFile)
-	pressure.InitCmd(rootCmd, configFile)
-	rgbled.InitCmd(rootCmd, configFile)
-	sensor.InitCmd(rootCmd, configFile)
-	temperature.InitCmd(rootCmd, configFile)
+	compression.InitCmd(rootCmd, &configFile)
+	convert.InitCmd(rootCmd, &configFile)
+	daemon.InitCmd(rootCmd, &configFile)
+	humidity.InitCmd(rootCmd, &configFile)
+	pressure.InitCmd(rootCmd, &configFile)
+	rgbled.InitCmd(rootCmd, &configFile)
+	sensor.InitCmd(rootCmd, &configFile)
+	temperature.InitCmd(rootCmd, &configFile)
 	rootCmd.Execute()
 }
diff --git a/cmd/compression/compression.go b/cmd/compression/compression.go
index ed3891b..463bb24 100644
--- a/cmd/compression/compression.go
+++ b/cmd/compression/compression.go
@@ -9,7 +9,7 @@ import (
 )
 
 var compression bool
-var configFile string
+var configFile *string
 
 var compressionCmd = &cobra.Command{
 	Use:     "compression",
@@ -33,7 +33,7 @@ var compressionCmd = &cobra.Command{
 	},
 }
 
-func InitCmd(cmd *cobra.Command, cnfFile string) {
+func InitCmd(cmd *cobra.Command, cnfFile *string) {
 	configFile = cnfFile
 	cmd.AddCommand(compressionCmd)
 
diff --git a/cmd/convert/convert.go b/cmd/convert/convert.go
index d5d67e5..554c88f 100644
--- a/cmd/convert/convert.go
+++ b/cmd/convert/convert.go
@@ -9,7 +9,7 @@ import (
 )
 
 var compression bool
-var configFile string
+var configFile *string
 
 var convertCmd = &cobra.Command{
 	Use:     "convert",
@@ -37,7 +37,7 @@ var convertCmd = &cobra.Command{
 }
 
 // Execute a
-func InitCmd(cmd *cobra.Command, cnfFile string) {
+func InitCmd(cmd *cobra.Command, cnfFile *string) {
 	configFile = cnfFile
 	cmd.AddCommand(convertCmd)
 	convertCmd.Flags().BoolVar(&compression, "compression", true, "Compress measured values")
diff --git a/cmd/daemon/daemon.go b/cmd/daemon/daemon.go
index 827ed00..bbd1bfb 100644
--- a/cmd/daemon/daemon.go
+++ b/cmd/daemon/daemon.go
@@ -12,7 +12,7 @@ import (
 
 var cleanCacheInterval string
 var compression bool
-var configFile string
+var configFile *string
 var round float64
 var temperatureUnit string
 
@@ -21,7 +21,7 @@ var daemonCmd = &cobra.Command{
 	Short: "Read continuously data from all enabled sensors",
 	Run: func(cmd *cobra.Command, args []string) {
 		// read configuration
-		cnf, err := config.Read(configFile)
+		cnf, err := config.Read(*configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
@@ -38,7 +38,7 @@ var daemonCmd = &cobra.Command{
 	},
 }
 
-func InitCmd(cmd *cobra.Command, cnfFile string) {
+func InitCmd(cmd *cobra.Command, cnfFile *string) {
 	configFile = cnfFile
 	cmd.AddCommand(daemonCmd)
 	daemonCmd.Flags().BoolVar(&compression, "compression", true, "Compress measured values")
diff --git a/cmd/humidity/humidity.go b/cmd/humidity/humidity.go
index 973a61c..ac7ed9f 100644
--- a/cmd/humidity/humidity.go
+++ b/cmd/humidity/humidity.go
@@ -5,7 +5,7 @@ import (
 )
 
 var compression bool
-var configFile string
+var configFile *string
 var round float64
 
 var humidityCmd = &cobra.Command{
@@ -14,7 +14,7 @@ var humidityCmd = &cobra.Command{
 }
 
 // Execute a
-func InitCmd(cmd *cobra.Command, cnfFile string) {
+func InitCmd(cmd *cobra.Command, cnfFile *string) {
 	configFile = cnfFile
 
 	cmd.AddCommand(humidityCmd)
diff --git a/cmd/humidity/list.go b/cmd/humidity/list.go
index 1518188..3b60c36 100644
--- a/cmd/humidity/list.go
+++ b/cmd/humidity/list.go
@@ -21,7 +21,7 @@ var listTemperatureCmd = &cobra.Command{
 	Run: func(cmd *cobra.Command, args []string) {
 
 		// read configuration
-		cnf, err := config.Read(configFile)
+		cnf, err := config.Read(*configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
diff --git a/cmd/humidity/read.go b/cmd/humidity/read.go
index 0d4eb86..326f0a3 100644
--- a/cmd/humidity/read.go
+++ b/cmd/humidity/read.go
@@ -23,7 +23,7 @@ var readHumidityCmd = &cobra.Command{
 	Run: func(cmd *cobra.Command, args []string) {
 
 		// read configuration
-		cnf, err := config.Read(configFile)
+		cnf, err := config.Read(*configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
diff --git a/cmd/pressure/list.go b/cmd/pressure/list.go
index 25c63d3..8e256c5 100644
--- a/cmd/pressure/list.go
+++ b/cmd/pressure/list.go
@@ -21,7 +21,7 @@ var listTemperatureCmd = &cobra.Command{
 	Run: func(cmd *cobra.Command, args []string) {
 
 		// read configuration
-		cnf, err := config.Read(configFile)
+		cnf, err := config.Read(*configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
diff --git a/cmd/pressure/pressure.go b/cmd/pressure/pressure.go
index a1a01a9..4f75206 100644
--- a/cmd/pressure/pressure.go
+++ b/cmd/pressure/pressure.go
@@ -5,7 +5,7 @@ import (
 )
 
 var compression bool
-var configFile string
+var configFile *string
 var round float64
 
 var pressureCmd = &cobra.Command{
@@ -14,7 +14,7 @@ var pressureCmd = &cobra.Command{
 }
 
 // Execute a
-func InitCmd(cmd *cobra.Command, cnfFile string) {
+func InitCmd(cmd *cobra.Command, cnfFile *string) {
 	configFile = cnfFile
 
 	cmd.AddCommand(pressureCmd)
diff --git a/cmd/pressure/read.go b/cmd/pressure/read.go
index b6c0979..bb94c30 100644
--- a/cmd/pressure/read.go
+++ b/cmd/pressure/read.go
@@ -23,7 +23,7 @@ var readPressureCmd = &cobra.Command{
 	Run: func(cmd *cobra.Command, args []string) {
 
 		// read configuration
-		cnf, err := config.Read(configFile)
+		cnf, err := config.Read(*configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
diff --git a/cmd/rgbled/add.go b/cmd/rgbled/add.go
index 2c07f50..0ed6dd9 100644
--- a/cmd/rgbled/add.go
+++ b/cmd/rgbled/add.go
@@ -21,7 +21,7 @@ var addRgbLedCmd = &cobra.Command{
 flucky rgb-led add my-led GPIO13 GPIO17 GPIO26`),
 	Run: func(cmd *cobra.Command, args []string) {
 		// read configuration
-		cnf, err := config.Read(configFile)
+		cnf, err := config.Read(*configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
@@ -62,7 +62,7 @@ flucky rgb-led add my-led GPIO13 GPIO17 GPIO26`),
 		}
 
 		// save new configuration
-		err = config.Write(cnf, configFile)
+		err = config.Write(cnf, *configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
diff --git a/cmd/rgbled/disable.go b/cmd/rgbled/disable.go
index 75ad8f7..d94b29b 100644
--- a/cmd/rgbled/disable.go
+++ b/cmd/rgbled/disable.go
@@ -17,7 +17,7 @@ flucky rgb-led disable 9f8abfc5-91f3-480c-a42d-b990b6f89e5d`,
 	Run: func(cmd *cobra.Command, args []string) {
 
 		// read configuration
-		cnf, err := config.Read(configFile)
+		cnf, err := config.Read(*configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
@@ -29,7 +29,7 @@ flucky rgb-led disable 9f8abfc5-91f3-480c-a42d-b990b6f89e5d`,
 		}
 
 		// save new configuration
-		err = config.Write(cnf, configFile)
+		err = config.Write(cnf, *configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
diff --git a/cmd/rgbled/enable.go b/cmd/rgbled/enable.go
index 8c60d8c..40b2540 100644
--- a/cmd/rgbled/enable.go
+++ b/cmd/rgbled/enable.go
@@ -17,7 +17,7 @@ flucky rgb-led enable 9f8abfc5-91f3-480c-a42d-b990b6f89e5d`,
 	Run: func(cmd *cobra.Command, args []string) {
 
 		// read configuration
-		cnf, err := config.Read(configFile)
+		cnf, err := config.Read(*configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
@@ -29,7 +29,7 @@ flucky rgb-led enable 9f8abfc5-91f3-480c-a42d-b990b6f89e5d`,
 		}
 
 		// save new configuration
-		err = config.Write(cnf, configFile)
+		err = config.Write(cnf, *configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
diff --git a/cmd/rgbled/list.go b/cmd/rgbled/list.go
index c7fa1f9..0fe4a7f 100644
--- a/cmd/rgbled/list.go
+++ b/cmd/rgbled/list.go
@@ -15,7 +15,7 @@ var listRgbLedCmd = &cobra.Command{
 	Aliases: []string{"ls"},
 	Run: func(cmd *cobra.Command, args []string) {
 		// read configuration
-		cnf, err := config.Read(configFile)
+		cnf, err := config.Read(*configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
diff --git a/cmd/rgbled/off.go b/cmd/rgbled/off.go
index f35db1b..6002b73 100644
--- a/cmd/rgbled/off.go
+++ b/cmd/rgbled/off.go
@@ -16,7 +16,7 @@ var offRgbLedCmd = &cobra.Command{
 	Run: func(cmd *cobra.Command, args []string) {
 
 		// read configuration
-		cnf, err := config.Read(configFile)
+		cnf, err := config.Read(*configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
diff --git a/cmd/rgbled/on.go b/cmd/rgbled/on.go
index 4c7a0e5..1bf471d 100644
--- a/cmd/rgbled/on.go
+++ b/cmd/rgbled/on.go
@@ -20,7 +20,7 @@ flucky rgb-led on 1c5b9424-f6e9-4a37-be5c-77e531e94aab red`,
 	Run: func(cmd *cobra.Command, args []string) {
 
 		// read configuration
-		cnf, err := config.Read(configFile)
+		cnf, err := config.Read(*configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
diff --git a/cmd/rgbled/remove.go b/cmd/rgbled/remove.go
index 6afd513..174f024 100644
--- a/cmd/rgbled/remove.go
+++ b/cmd/rgbled/remove.go
@@ -17,7 +17,7 @@ flucky rgb-led remove 9f8abfc5-91f3-480c-a42d-b990b6f89e5d`,
 	Args:    cobra.ExactArgs(1),
 	Run: func(cmd *cobra.Command, args []string) {
 		// read configuration
-		cnf, err := config.Read(configFile)
+		cnf, err := config.Read(*configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
@@ -29,7 +29,7 @@ flucky rgb-led remove 9f8abfc5-91f3-480c-a42d-b990b6f89e5d`,
 		}
 
 		// save new configuration
-		err = config.Write(cnf, configFile)
+		err = config.Write(cnf, *configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
diff --git a/cmd/rgbled/rename.go b/cmd/rgbled/rename.go
index 3dfa29d..299f653 100644
--- a/cmd/rgbled/rename.go
+++ b/cmd/rgbled/rename.go
@@ -16,7 +16,7 @@ flucky rgb-led disable my-led my-sweet-led
 flucky rgb-led disable 9f8abfc5-91f3-480c-a42d-b990b6f89e5d my-sweet-led`,
 	Run: func(cmd *cobra.Command, args []string) {
 		// read configuration
-		cnf, err := config.Read(configFile)
+		cnf, err := config.Read(*configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
@@ -28,7 +28,7 @@ flucky rgb-led disable 9f8abfc5-91f3-480c-a42d-b990b6f89e5d my-sweet-led`,
 		}
 
 		// save new configuration
-		err = config.Write(cnf, configFile)
+		err = config.Write(cnf, *configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
diff --git a/cmd/rgbled/rgbled.go b/cmd/rgbled/rgbled.go
index b5bb5be..340797e 100644
--- a/cmd/rgbled/rgbled.go
+++ b/cmd/rgbled/rgbled.go
@@ -4,7 +4,7 @@ import (
 	"github.com/spf13/cobra"
 )
 
-var configFile string
+var configFile *string
 
 var rgbLedCmd = &cobra.Command{
 	Use:   "rgb-led",
@@ -12,7 +12,7 @@ var rgbLedCmd = &cobra.Command{
 }
 
 // InitCmd da
-func InitCmd(cmd *cobra.Command, cnfFile string) {
+func InitCmd(cmd *cobra.Command, cnfFile *string) {
 	configFile = cnfFile
 
 	cmd.AddCommand(rgbLedCmd)
diff --git a/cmd/sensor/add.go b/cmd/sensor/add.go
index 7ff1bf1..491a09e 100644
--- a/cmd/sensor/add.go
+++ b/cmd/sensor/add.go
@@ -25,7 +25,7 @@ flucky sensor add --wire-id 28-011432f0bb3d outdoor DS18B20
 flucky sensor add --i2c-bus 1 --i2c-address 0x76 wetter-station BME280`,
 	Run: func(cmd *cobra.Command, args []string) {
 		// read configuration
-		cnf, err := config.Read(configFile)
+		cnf, err := config.Read(*configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
@@ -80,7 +80,7 @@ flucky sensor add --i2c-bus 1 --i2c-address 0x76 wetter-station BME280`,
 		}
 
 		// save new configuration
-		err = config.Write(cnf, configFile)
+		err = config.Write(cnf, *configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
diff --git a/cmd/sensor/disable.go b/cmd/sensor/disable.go
index 7076ee2..585562e 100644
--- a/cmd/sensor/disable.go
+++ b/cmd/sensor/disable.go
@@ -15,7 +15,7 @@ var disableSensorCmd = &cobra.Command{
 	Run: func(cmd *cobra.Command, args []string) {
 
 		// read configuration
-		cnf, err := config.Read(configFile)
+		cnf, err := config.Read(*configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
@@ -27,7 +27,7 @@ var disableSensorCmd = &cobra.Command{
 		}
 
 		// save new configuration
-		err = config.Write(cnf, configFile)
+		err = config.Write(cnf, *configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
diff --git a/cmd/sensor/enable.go b/cmd/sensor/enable.go
index 27ee865..971995f 100644
--- a/cmd/sensor/enable.go
+++ b/cmd/sensor/enable.go
@@ -15,7 +15,7 @@ var enableSensorCmd = &cobra.Command{
 	Run: func(cmd *cobra.Command, args []string) {
 
 		// read configuration
-		cnf, err := config.Read(configFile)
+		cnf, err := config.Read(*configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
@@ -27,7 +27,7 @@ var enableSensorCmd = &cobra.Command{
 		}
 
 		// save new configuration
-		err = config.Write(cnf, configFile)
+		err = config.Write(cnf, *configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
diff --git a/cmd/sensor/list.go b/cmd/sensor/list.go
index 5bab7f8..8120e2f 100644
--- a/cmd/sensor/list.go
+++ b/cmd/sensor/list.go
@@ -15,7 +15,7 @@ var listSensorCmd = &cobra.Command{
 	Aliases: []string{"ls"},
 	Run: func(cmd *cobra.Command, args []string) {
 		// read configuration
-		cnf, err := config.Read(configFile)
+		cnf, err := config.Read(*configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
@@ -27,7 +27,7 @@ var listSensorCmd = &cobra.Command{
 		}
 
 		// save new configuration
-		err = config.Write(cnf, configFile)
+		err = config.Write(cnf, *configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
diff --git a/cmd/sensor/remove.go b/cmd/sensor/remove.go
index f249563..9f9bbeb 100644
--- a/cmd/sensor/remove.go
+++ b/cmd/sensor/remove.go
@@ -15,7 +15,7 @@ var rmSensorCmd = &cobra.Command{
 	Args:    cobra.ExactArgs(1),
 	Run: func(cmd *cobra.Command, args []string) {
 		// read configuration
-		cnf, err := config.Read(configFile)
+		cnf, err := config.Read(*configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
@@ -27,7 +27,7 @@ var rmSensorCmd = &cobra.Command{
 		}
 
 		// save new configuration
-		err = config.Write(cnf, configFile)
+		err = config.Write(cnf, *configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
diff --git a/cmd/sensor/rename.go b/cmd/sensor/rename.go
index 1dc0a30..51fdd07 100644
--- a/cmd/sensor/rename.go
+++ b/cmd/sensor/rename.go
@@ -15,7 +15,7 @@ var renameSensorCmd = &cobra.Command{
 	Example: fmt.Sprintf("flucky sensor rename indoor outdoor\nflucky sensor rename f98b00ea-a9b2-4e00-924f-113859d0af2d outdoor"),
 	Run: func(cmd *cobra.Command, args []string) {
 		// read configuration
-		cnf, err := config.Read(configFile)
+		cnf, err := config.Read(*configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
@@ -27,7 +27,7 @@ var renameSensorCmd = &cobra.Command{
 		}
 
 		// save new configuration
-		err = config.Write(cnf, configFile)
+		err = config.Write(cnf, *configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
diff --git a/cmd/sensor/sensor.go b/cmd/sensor/sensor.go
index 3c22105..cb2c87a 100644
--- a/cmd/sensor/sensor.go
+++ b/cmd/sensor/sensor.go
@@ -4,7 +4,7 @@ import (
 	"github.com/spf13/cobra"
 )
 
-var configFile string
+var configFile *string
 
 var sensorCmd = &cobra.Command{
 	Use:   "sensor",
@@ -12,7 +12,7 @@ var sensorCmd = &cobra.Command{
 }
 
 // InitCmd da
-func InitCmd(cmd *cobra.Command, cnfFile string) {
+func InitCmd(cmd *cobra.Command, cnfFile *string) {
 	configFile = cnfFile
 
 	cmd.AddCommand(sensorCmd)
diff --git a/cmd/temperature/list.go b/cmd/temperature/list.go
index c474f79..36e700a 100644
--- a/cmd/temperature/list.go
+++ b/cmd/temperature/list.go
@@ -21,7 +21,7 @@ var listTemperatureCmd = &cobra.Command{
 	Run: func(cmd *cobra.Command, args []string) {
 
 		// read configuration
-		cnf, err := config.Read(configFile)
+		cnf, err := config.Read(*configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
diff --git a/cmd/temperature/read.go b/cmd/temperature/read.go
index 9d05ae3..6e905ad 100644
--- a/cmd/temperature/read.go
+++ b/cmd/temperature/read.go
@@ -25,7 +25,7 @@ var readTemperatureCmd = &cobra.Command{
 	Run: func(cmd *cobra.Command, args []string) {
 
 		// read configuration
-		cnf, err := config.Read(configFile)
+		cnf, err := config.Read(*configFile)
 		if err != nil {
 			log.Fatalln(err)
 		}
diff --git a/cmd/temperature/temperature.go b/cmd/temperature/temperature.go
index 486770b..9417ba0 100644
--- a/cmd/temperature/temperature.go
+++ b/cmd/temperature/temperature.go
@@ -7,7 +7,7 @@ import (
 )
 
 var compression bool
-var configFile string
+var configFile *string
 var round float64
 
 var temperatureCmd = &cobra.Command{
@@ -17,7 +17,7 @@ var temperatureCmd = &cobra.Command{
 }
 
 // Execute a
-func InitCmd(cmd *cobra.Command, cnfFile string) {
+func InitCmd(cmd *cobra.Command, cnfFile *string) {
 	configFile = cnfFile
 	cmd.AddCommand(temperatureCmd)