initial

.gitignore

@@ -0,0 +1 @@
+field

go.mod

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+module sneak.berlin/go/field
+
+go 1.22.2

main.go

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+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	if len(os.Args) < 2 {
+		fmt.Fprintf(os.Stderr, "usage: %s <field-number>", os.Args[0])
+		os.Exit(1)
+	}
+
+	fieldNum, err := strconv.Atoi(os.Args[1])
+	if err != nil || fieldNum < 1 {
+		fmt.Fprintln(os.Stderr, "invalid field number:", os.Args[1])
+		os.Exit(1)
+	}
+
+	scanner := bufio.NewScanner(os.Stdin)
+	for scanner.Scan() {
+		line := scanner.Text()
+		fields := strings.Fields(line)
+		if len(fields) >= fieldNum {
+			fmt.Println(fields[fieldNum-1])
+		}
+	}
+	if err := scanner.Err(); err != nil {
+		fmt.Fprintln(os.Stderr, "error reading input:", err)
+	}
+}