Update flag usage messages to include whether the arguments are requi…

…red or optional in the tcpdup tool.
skywind3000 · Dec 23, 2024 · db20f20 · db20f20
1 parent 8613756
commit db20f20
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diff --git a/README.md b/README.md
@@ -29,13 +29,13 @@ tcpdup -listen 0.0.0.0:8080 -target 192.168.1.100:8080 \
 ```text
 Usage of ./tcpdup:
 -listen
-  local address, eg: 0.0.0.0:8080
+  local address (required), eg: 0.0.0.0:8080
 -target
-  destination address, eg: 8.8.8.8:8080
+  destination address (required), eg: 8.8.8.8:8080
 -input
-  input duplication address, eg: 127.0.0.1:8081
+  input duplication address (optional), eg: 127.0.0.1:8081
 -output
-  output duplication address, eg: 127.0.0.1:8082
+  output duplication address (optional), eg: 127.0.0.1:8082
 ```
 
 ## Credit

diff --git a/main.go b/main.go
@@ -39,10 +39,10 @@ func start(listen string, target string, input string, output string) int {
 }
 
 func main() {
-	listen := flag.String("listen", "", "local address, eg: 0.0.0.0:8080")
-	target := flag.String("target", "", "destination address, eg: 8.8.8.8:8080")
-	input := flag.String("input", "", "input duplication address, eg: 127.0.0.1:8081")
-	output := flag.String("output", "", "output duplication address, eg: 127.0.0.1:8082")
+	listen := flag.String("listen", "", "local address (required), eg: 0.0.0.0:8080")
+	target := flag.String("target", "", "destination address (required), eg: 8.8.8.8:8080")
+	input := flag.String("input", "", "input duplication address (optional), eg: 127.0.0.1:8081")
+	output := flag.String("output", "", "output duplication address (optional), eg: 127.0.0.1:8082")
 	flag.Usage = func() {
 		flagSet := flag.CommandLine
 		fmt.Printf("Usage of %s:\n", os.Args[0])