| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "fmt" |
| 5 | "os" |
| 6 | "time" |
| 7 | ) |
| 8 | |
| 9 | func main() { |
| 10 | if len(os.Args) != 2 { |
| 11 | usageError() |
| 12 | } |
| 13 | d, err := time.ParseDuration(os.Args[1]) |
| 14 | if err != nil { |
| 15 | fmt.Fprintf(os.Stderr, "Could not parse duration: %s\n", err) |
| 16 | usageError() |
| 17 | } |
| 18 | |
| 19 | time.Sleep(d) |
| 20 | } |
| 21 | |
| 22 | func usageError() { |
| 23 | fmt.Fprintf(os.Stderr, "Usage: %s <duration>\n", os.Args[0]) |
| 24 | fmt.Fprintln(os.Stderr, `Valid time units are "ns", "us" (or "µs"), "ms", "s", "m", "h".`) |
| 25 | fmt.Fprintln(os.Stderr, "See https://godoc.org/time#ParseDuration for more.") |
| 26 | os.Exit(-1) |
| 27 | } |