diff --git a/bytes/replace.go b/bytes/replace.go
index a62a161..9826309 100644
--- a/bytes/replace.go
+++ b/bytes/replace.go
@@ -51,4 +51,3 @@ func Replace(b []byte, src, dest []byte, n int) []byte {
 }
 
 // ---------------------------------------------------
-
diff --git a/bytes/replace_test.go b/bytes/replace_test.go
index bf1925f..6033405 100644
--- a/bytes/replace_test.go
+++ b/bytes/replace_test.go
@@ -51,4 +51,3 @@ func TestInsertAt(t *testing.T) {
 		t.Fatal("InsertAt failed:", ret)
 	}
 }
-
diff --git a/cmdline/cmdline_test.go b/cmdline/cmdline_test.go
index 33e2157..929dc36 100644
--- a/cmdline/cmdline_test.go
+++ b/cmdline/cmdline_test.go
@@ -55,52 +55,52 @@ func TestParse(t *testing.T) {
 
 	cases := []caseParse{
 		{
-			code: ";b",
-			cmd: []string{"b"},
+			code:     ";b",
+			cmd:      []string{"b"},
 			codeNext: "",
-			err: "end of file",
+			err:      "end of file",
 		},
 		{
-			code: ";b;abc",
-			cmd: []string{"b"},
+			code:     ";b;abc",
+			cmd:      []string{"b"},
 			codeNext: "abc",
-			err: nil,
+			err:      nil,
 		},
 		{
-			code: "a`b`\\c",
-			cmd: []string{"a[b]c"},
+			code:     "a`b`\\c",
+			cmd:      []string{"a[b]c"},
 			codeNext: "",
-			err: "end of file",
+			err:      "end of file",
 		},
 		{
-			code: "a`b`c 'c\\n`123`' \"c\\n\"",
-			cmd: []string{"a[b]c", "c\\n`123`", "cn"},
+			code:     "a`b`c 'c\\n`123`' \"c\\n\"",
+			cmd:      []string{"a[b]c", "c\\n`123`", "cn"},
 			codeNext: "",
-			err: "end of file",
+			err:      "end of file",
 		},
 		{
-			code: "auth qboxtest 'mac AccessKey SecretKey'",
-			cmd: []string{"auth", "qboxtest", "mac AccessKey SecretKey"},
+			code:     "auth qboxtest 'mac AccessKey SecretKey'",
+			cmd:      []string{"auth", "qboxtest", "mac AccessKey SecretKey"},
 			codeNext: "",
-			err: "end of file",
+			err:      "end of file",
 		},
 		{
-			code: "post http://rs.qiniu.com/delete/`base64 Bucket:Key`",
-			cmd: []string{"post", "http://rs.qiniu.com/delete/[base64 Bucket:Key]"},
+			code:     "post http://rs.qiniu.com/delete/`base64 Bucket:Key`",
+			cmd:      []string{"post", "http://rs.qiniu.com/delete/[base64 Bucket:Key]"},
 			codeNext: "",
-			err: "end of file",
+			err:      "end of file",
 		},
 		{
-			code: "post http://rs.qiniu.com/delete `base64 Bucket:Key`",
-			cmd: []string{"post", "http://rs.qiniu.com/delete", "[base64 Bucket:Key]"},
+			code:     "post http://rs.qiniu.com/delete `base64 Bucket:Key`",
+			cmd:      []string{"post", "http://rs.qiniu.com/delete", "[base64 Bucket:Key]"},
 			codeNext: "",
-			err: "end of file",
+			err:      "end of file",
 		},
 		{
-			code: "post http://rs.qiniu.com/delete/|base64 Bucket:Key|",
-			cmd: []string{"post", "http://rs.qiniu.com/delete/[base64 Bucket:Key]"},
+			code:     "post http://rs.qiniu.com/delete/|base64 Bucket:Key|",
+			cmd:      []string{"post", "http://rs.qiniu.com/delete/[base64 Bucket:Key]"},
 			codeNext: "",
-			err: "end of file",
+			err:      "end of file",
 		},
 		{
 			code: `json '[
@@ -110,43 +110,43 @@ func TestParse(t *testing.T) {
 	{"code": 200}, {"code": 612}
 ]`},
 			codeNext: "",
-			err: "end of file",
+			err:      "end of file",
 		},
 		{
-			code: "auth qboxtest ```\nmac AccessKey SecretKey```",
-			cmd: []string{"auth", "qboxtest", "mac AccessKey SecretKey"},
+			code:     "auth qboxtest ```\nmac AccessKey SecretKey```",
+			cmd:      []string{"auth", "qboxtest", "mac AccessKey SecretKey"},
 			codeNext: "",
-			err: "end of file",
+			err:      "end of file",
 		},
 		{
-			code: "auth qboxtest ===\nmac AccessKey SecretKey```",
-			cmd: []string{"auth", "qboxtest"},
+			code:     "auth qboxtest ===\nmac AccessKey SecretKey```",
+			cmd:      []string{"auth", "qboxtest"},
 			codeNext: "mac AccessKey SecretKey```",
-			err: "incomplete string, expect ===",
+			err:      "incomplete string, expect ===",
 		},
 		{
-			code: "auth qboxtest ===\rmac AccessKey SecretKey===",
-			cmd: []string{"auth", "qboxtest", "mac AccessKey SecretKey"},
+			code:     "auth qboxtest ===\rmac AccessKey SecretKey===",
+			cmd:      []string{"auth", "qboxtest", "mac AccessKey SecretKey"},
 			codeNext: "",
-			err: "end of file",
+			err:      "end of file",
 		},
 		{
-			code: "auth qboxtest ===\n\rmac AccessKey SecretKey===",
-			cmd: []string{"auth", "qboxtest", "\rmac AccessKey SecretKey"},
+			code:     "auth qboxtest ===\n\rmac AccessKey SecretKey===",
+			cmd:      []string{"auth", "qboxtest", "\rmac AccessKey SecretKey"},
 			codeNext: "",
-			err: "end of file",
+			err:      "end of file",
 		},
 		{
-			code: "auth qboxtest ===\r\n\nmac AccessKey SecretKey===",
-			cmd: []string{"auth", "qboxtest", "\nmac AccessKey SecretKey"},
+			code:     "auth qboxtest ===\r\n\nmac AccessKey SecretKey===",
+			cmd:      []string{"auth", "qboxtest", "\nmac AccessKey SecretKey"},
 			codeNext: "",
-			err: "end of file",
+			err:      "end of file",
 		},
 		{
-			code: "auth qboxtest ===mac AccessKey SecretKey===",
-			cmd: []string{"auth", "qboxtest", "mac AccessKey SecretKey"},
+			code:     "auth qboxtest ===mac AccessKey SecretKey===",
+			cmd:      []string{"auth", "qboxtest", "mac AccessKey SecretKey"},
 			codeNext: "",
-			err: "end of file",
+			err:      "end of file",
 		},
 	}
 
@@ -170,4 +170,3 @@ func TestParse(t *testing.T) {
 }
 
 // ---------------------------------------------------------------------------
-
diff --git a/cmdline/escape.go b/cmdline/escape.go
index d0f8b6b..67e89de 100644
--- a/cmdline/escape.go
+++ b/cmdline/escape.go
@@ -4,7 +4,7 @@ package cmdline
 
 const (
 	escTableBaseChar = '0'
-	escTableLen = ('z' - escTableBaseChar + 1)
+	escTableLen      = ('z' - escTableBaseChar + 1)
 )
 
 var escTable = []byte{
@@ -88,11 +88,10 @@ var escTable = []byte{
 
 func defaultEscape(c byte) string {
 
-	if c - escTableBaseChar < escTableLen {
-		c = escTable[c - escTableBaseChar]
+	if c-escTableBaseChar < escTableLen {
+		c = escTable[c-escTableBaseChar]
 	}
 	return string(c)
 }
 
 // ---------------------------------------------------------------------------
-
diff --git a/cmdline/escape_test.go b/cmdline/escape_test.go
index 7164216..be1e371 100644
--- a/cmdline/escape_test.go
+++ b/cmdline/escape_test.go
@@ -38,4 +38,3 @@ func checkEscapeChar(t *testing.T, i, exp int) {
 }
 
 // ---------------------------------------------------------------------------
-
diff --git a/errors/error_info.go b/errors/error_info.go
index 28fe763..828f081 100644
--- a/errors/error_info.go
+++ b/errors/error_info.go
@@ -61,10 +61,10 @@ func Err(err error) error {
 // --------------------------------------------------------------------
 
 type ErrorInfo struct {
-	err  error
-	why  error
-	cmd  []interface{}
-	pc   uintptr
+	err error
+	why error
+	cmd []interface{}
+	pc  uintptr
 }
 
 func shortFile(file string) string {
@@ -84,7 +84,7 @@ func Info(err error, cmd ...interface{}) *ErrorInfo {
 }
 
 func InfoEx(calldepth int, err error, cmd ...interface{}) *ErrorInfo {
-	pc, _, _, ok := runtime.Caller(calldepth+1)
+	pc, _, _, ok := runtime.Caller(calldepth + 1)
 	if !ok {
 		pc = 0
 	}
diff --git a/jsonutil/json_string.go b/jsonutil/json_string.go
index 91ef172..8c4cff7 100644
--- a/jsonutil/json_string.go
+++ b/jsonutil/json_string.go
@@ -12,7 +12,7 @@ import (
 func Unmarshal(data string, v interface{}) error {
 
 	sh := *(*reflect.StringHeader)(unsafe.Pointer(&data))
-	arr := (*[1<<30]byte)(unsafe.Pointer(sh.Data))
+	arr := (*[1 << 30]byte)(unsafe.Pointer(sh.Data))
 	return json.Unmarshal(arr[:sh.Len], v)
 }