good good study, day day up!

vendor/gopl.io/ch7/sleep/sleep.go

@@ -0,0 +1,25 @@
+// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+// See page 179.
+
+// The sleep program sleeps for a specified period of time.
+package main
+
+import (
+	"flag"
+	"fmt"
+	"time"
+)
+
+//!+sleep
+var period = flag.Duration("period", 1*time.Second, "sleep period")
+
+func main() {
+	flag.Parse()
+	fmt.Printf("Sleeping for %v...", *period)
+	time.Sleep(*period)
+	fmt.Println()
+}
+
+//!-sleep