Improve help text.

.goreleaser.yaml

@@ -10,6 +10,7 @@ builds:
       - -w 
       - -X main.version={{.Version}}
       - -X main.gitCommit={{.ShortCommit}}
+      - -X main.binaryName={{.ProjectName}}
     targets:
       - linux_amd64
       - linux_arm64

main/help.go

@@ -0,0 +1,17 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+)
+
+func programVersion() {
+	fmt.Fprintf(flag.CommandLine.Output(), "Version: %s\n Commit: %s\n", version, gitCommit)
+}
+
+func programUsage() {
+	fmt.Fprintf(flag.CommandLine.Output(), "Usage: %s [flags] hostname.or.ip.address\n\nFlags:\n", binaryName)
+	flag.PrintDefaults()
+	fmt.Fprintln(flag.CommandLine.Output())
+	programVersion()
+}

main/main.go

@@ -12,8 +12,10 @@ import (
 )
 
 var (
-	cfg                mffp.Config
-	version, gitCommit string
+	cfg        mffp.Config
+	version    = "development"
+	gitCommit  = ""
+	binaryName = "mffprober"
 )
 
 func printVersion(v, g string) {
@@ -25,6 +27,7 @@ func init() {
 		v, e bool
 		h    string
 	)
+	flag.Usage = func() { programUsage() }
 
 	flag.StringVar(&h, "host", "", "DEPRECATED: Specify host name/address after the flags.")
 	flag.DurationVar(&cfg.Interval, "interval", 10*time.Second, "Polling interval in seconds")