publish ch1/...

ch1/echo1/main.go

@@ -0,0 +1,24 @@
+// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+// See page 4.
+//!+
+
+// Echo1 prints its command-line arguments.
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+func main() {
+	var s, sep string
+	for i := 1; i < len(os.Args); i++ {
+		s += sep + os.Args[i]
+		sep = " "
+	}
+	fmt.Println(s)
+}
+
+//!-