Created
October 21, 2025 04:04
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| package main | |
| import ( | |
| "flag" | |
| "fmt" | |
| ) | |
| // usage は、ヘルプメッセージです。 | |
| const usage = ` | |
| usage go run main.go [-m MESSAGE] | |
| optional arguments: | |
| -m, --message message (default: Fight dayo!) | |
| -v, --version show version | |
| ` | |
| const ( | |
| // version は、このアプリケーションのバージョン番号です。 | |
| version = "1.0.0" | |
| ) | |
| var ( | |
| // message は、表示するメッセージです。 | |
| message = "Fight dayo!" | |
| ) | |
| func main() { | |
| flag.StringVar(&message, "m", "message") | |
| flag.StringVar(&message, "message", "message") | |
| flag.Usage = func () { | |
| fmt.Print(usage) | |
| } | |
| flag.Parse() | |
| fmt.Println(message) | |
| } |
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