It's a little unclear how os.stdin actually works. Why, if you just run the
program, is data from stdin constantly being listened to?
For example:
func main() {
sc := bufio.NewScanner(os.Stdin)
for sc.Scan() {
txt := sc.Text()
fmt.Printf("echo: %s\n", txt)
}
} But if you send it to stdin ahead of time, the loop will run once and the
program will exit(echo smth | go run main.go)
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