diff --git a/str.go b/str.go
index 5fe1e03..a5a84a6 100644
--- a/str.go
+++ b/str.go
@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"math/rand"
+	"os"
 	"strings"
 	"time"
 )
@@ -42,7 +43,7 @@ func GetRandomCharString(l int) string {
 	return string(result)
 }
 
-//skip
+// skip
 func Skip(s string, sep string, n int) string {
 	seplen := len(sep)
 	if seplen == 0 || n < 0 {
@@ -104,8 +105,9 @@ func JsonstrToStrMap(jsonstr string) (m map[string]string) {
 }
 
 // string to string map to string
-//   example: "K1:V1;K2:V2"
-//         => {K1:V1, K2:V2}
+//
+//	example: "K1:V1;K2:V2"
+//	      => {K1:V1, K2:V2}
 func StringToStrMap(str string, sep1, sep2 string) (m map[string]string) {
 	m = map[string]string{}
 	for _, kvstr := range strings.Split(str, sep1) {
@@ -115,3 +117,12 @@ func StringToStrMap(str string, sep1, sep2 string) (m map[string]string) {
 	}
 	return m
 }
+
+// get os env with default
+func GetEnvDefault(key, defval string) string {
+	if val, ok := os.LookupEnv(key); ok {
+		return val
+	} else {
+		return defval
+	}
+}