diff --git a/flags.go b/flags.go
index 927ccb5..f6ae676 100644
--- a/flags.go
+++ b/flags.go
@@ -27,6 +27,7 @@ package log
 
 import (
 	"net/http"
+	"os"
 	"sync"
 )
 
@@ -56,6 +57,7 @@ type LogFlag struct {
 
 var flags []*LogFlag
 var daemonMode bool
+var captureMode *os.File
 var httpMode http.ResponseWriter
 
 func init() {
diff --git a/reallog.go b/reallog.go
index 347db85..3c565a3 100644
--- a/reallog.go
+++ b/reallog.go
@@ -7,12 +7,17 @@ import (
 	"fmt"
 	reallog "log"
 	"net/http"
+	"os"
 )
 
 func DaemonMode(b bool) {
 	daemonMode = b
 }
 
+func CaptureMode(f *os.File) {
+	captureMode = f
+}
+
 func HttpMode(w http.ResponseWriter) {
 	httpMode = w
 }
@@ -27,9 +32,18 @@ func DaemonShow() {
 
 func realPrintln(a ...any) {
 	if daemonMode {
-		fmt.Println(a...)
+		if captureMode == nil {
+			fmt.Println(a...)
+		} else {
+			fmt.Fprintln(captureMode, a...)
+		}
 	} else {
-		reallog.Println(a...)
+		if captureMode == nil {
+			fmt.Println(a...)
+		} else {
+			// TODO: add datestamp
+			fmt.Fprintln(captureMode, a...)
+		}
 	}
 	if httpMode != nil {
 		s := fmt.Sprint(a...)
@@ -39,9 +53,17 @@ func realPrintln(a ...any) {
 
 func realPrintf(s string, a ...any) {
 	if daemonMode {
-		fmt.Printf(s, a...)
+		if captureMode == nil {
+			fmt.Printf(s, a...)
+		} else {
+			fmt.Fprintf(captureMode, s, a...)
+		}
 	} else {
-		reallog.Printf(s, a...)
+		if captureMode == nil {
+			reallog.Printf(s, a...)
+		} else {
+			fmt.Fprintf(captureMode, s, a...)
+		}
 	}
 	if httpMode != nil {
 		fmt.Fprintln(httpMode, fmt.Sprintf(s, a...))