Go实例: Line Filters
package main
import (
"bufio"
"fmt"
"os"
"strings"
)
func main() {
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
ucl := strings.ToUpper(scanner.Text())
fmt.Println(ucl)
}
if err := scanner.Err(); err != nil {
fmt.Fprintln(os.Stderr, "error:", err)
os.Exit(1)
}
}$ echo 'hello' > /tmp/lines
$ echo 'filter' >> /tmp/lines
$ cat /tmp/lines | go run line-filters.go
HELLO
FILTER
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