diff --git a/g/database/gkafka/gkafka.go b/g/database/gkafka/gkafka.go
index c8f3f3de8..8121852b3 100644
--- a/g/database/gkafka/gkafka.go
+++ b/g/database/gkafka/gkafka.go
@@ -200,7 +200,7 @@ func (client *Client) SyncSend(message *Message) error {
     return nil
 }
 
-// Send data to kafka in asynchronized way.
+// Send data to kafka in asynchronized way(concurrent safe).
 func (client *Client) AsyncSend(message *Message) error {
     if client.asyncProducer == nil {
         if p, err := sarama.NewAsyncProducer(strings.Split(client.Config.Servers, ","), &client.Config.Config); err != nil {
diff --git a/g/os/gfile/gfile_contents.go b/g/os/gfile/gfile_contents.go
index 26cb3d737..a65c4a702 100644
--- a/g/os/gfile/gfile_contents.go
+++ b/g/os/gfile/gfile_contents.go
@@ -15,7 +15,9 @@ import (
 
 const (
     // 方法中涉及到读取的时候的缓冲大小
-    gREAD_BUFFER = 1024
+    gREAD_BUFFER      = 1024
+    // 方法中涉及到文件指针池的默认缓存时间(秒)
+    gFILE_POOL_EXPIRE = 60
 )
 
 // (文本)读取文件内容
@@ -88,10 +90,10 @@ func GetNextCharOffset(file *os.File, char byte, start int64) int64 {
         if n, err := file.ReadAt(buffer, offset); n > 0 {
             for i := 0; i < n; i++ {
                 if buffer[i] == char {
-                    return int64(i)
+                    return int64(i) + offset
                 }
             }
-            offset++
+            offset += int64(n)
         } else if err != nil {
             break
         }
@@ -99,10 +101,32 @@ func GetNextCharOffset(file *os.File, char byte, start int64) int64 {
     return -1
 }
 
-// 获得文件内容直到下一个指定字节的位置(返回值不包含该位置字符内容)
+// 获得文件内容下一个指定字节的位置
+func GetNextCharOffsetByPath(path string, char byte, start int64) int64 {
+    if f, err := gfpool.Open(path, os.O_RDONLY, 0666, gFILE_POOL_EXPIRE*1000); err == nil {
+        defer f.Close()
+        return GetNextCharOffset(&f.File, char, start)
+    } else {
+        // panic(err)
+    }
+    return -1
+}
+
+// 获得文件内容直到下一个指定字节的位置(返回值包含该位置字符内容)
 func GetBinContentsTilChar(file *os.File, char byte, start int64) ([]byte, int64) {
     if offset := GetNextCharOffset(file, char, start); offset != -1 {
-        return GetBinContentsByTwoOffsets(file, start, offset), offset
+        return GetBinContentsByTwoOffsets(file, start, offset + 1), offset
+    }
+    return nil, -1
+}
+
+// 获得文件内容直到下一个指定字节的位置(返回值包含该位置字符内容)
+func GetBinContentsTilCharByPath(path string, char byte, start int64) ([]byte, int64) {
+    if f, err := gfpool.Open(path, os.O_RDONLY, 0666, gFILE_POOL_EXPIRE*1000); err == nil {
+        defer f.Close()
+        return GetBinContentsTilChar(&f.File, char, start)
+    } else {
+        // panic(err)
     }
     return nil, -1
 }
@@ -114,4 +138,15 @@ func GetBinContentsByTwoOffsets(file *os.File, start int64, end int64) []byte {
         return nil
     }
     return buffer
+}
+
+// 获得文件内容中两个offset之间的内容 [start, end)
+func GetBinContentsByTwoOffsetsByPath(path string, start int64, end int64) []byte {
+    if f, err := gfpool.Open(path, os.O_RDONLY, 0666, gFILE_POOL_EXPIRE*1000); err == nil {
+        defer f.Close()
+        return GetBinContentsByTwoOffsets(&f.File, start, end)
+    } else {
+        // panic(err)
+    }
+    return nil
 }
\ No newline at end of file
diff --git a/g/os/gfile/gfile_size.go b/g/os/gfile/gfile_size.go
index ec5075757..ad82aadf6 100644
--- a/g/os/gfile/gfile_size.go
+++ b/g/os/gfile/gfile_size.go
@@ -13,11 +13,11 @@ import (
 
 // 文件大小(bytes)
 func Size(path string) int64 {
-    f, e := os.Stat(path)
+    s, e := os.Stat(path)
     if e != nil {
         return 0
     }
-    return f.Size()
+    return s.Size()
 }
 
 // 格式化文件大小
diff --git a/g/os/gfpool/gfpool.go b/g/os/gfpool/gfpool.go
index 919fd813e..6bf38aef0 100644
--- a/g/os/gfpool/gfpool.go
+++ b/g/os/gfpool/gfpool.go
@@ -33,7 +33,7 @@ type File struct {
 // 全局指针池，expire < 0表示不过期，expire = 0表示使用完立即回收，expire > 0表示超时回收
 var pools = gmap.NewStringInterfaceMap()
 
-// 获得文件对象，并自动创建指针池
+// 获得文件对象，并自动创建指针池(过期时间单位：毫秒)
 func Open(path string, flag int, perm os.FileMode, expire...int) (*File, error) {
     fpExpire := 0
     if len(expire) > 0 {
@@ -54,6 +54,7 @@ func OpenFile(path string, flag int, perm os.FileMode, expire...int) (*File, err
 }
 
 // 创建一个文件指针池，expire = 0表示不过期，expire < 0表示使用完立即回收，expire > 0表示超时回收，默认值为0不过期
+// 过期时间单位：毫秒
 func New(path string, flag int, perm os.FileMode, expire...int) *Pool {
     fpExpire := 0
     if len(expire) > 0 {
diff --git a/geg/os/gfile/gfile_contents.go b/geg/os/gfile/gfile_contents.go
index ecf913a06..f6f5ac31a 100644
--- a/geg/os/gfile/gfile_contents.go
+++ b/geg/os/gfile/gfile_contents.go
@@ -9,11 +9,10 @@ func main() {
     path    := "/tmp/temp"
     content := `123
 456
-789`
+789
+`
     gfile.PutContents(path, content)
-    f, err := gfile.Open(path)
-    if err != nil {
-        panic(err)
-    }
-    fmt.Println(gfile.GetBinContentsTilChar(f, '\n', 0))
+    fmt.Println(gfile.GetBinContentsTilCharByPath(path, '\n', 0))
+    fmt.Println(gfile.GetBinContentsTilCharByPath(path, '\n', 3))
+    fmt.Println(gfile.GetBinContentsTilCharByPath(path, '\n', 8))
 }
diff --git a/geg/os/gproc/gproc_shellexec.go b/geg/os/gproc/gproc_shellexec.go
index 8abb43624..6c10d531d 100644
--- a/geg/os/gproc/gproc_shellexec.go
+++ b/geg/os/gproc/gproc_shellexec.go
@@ -7,6 +7,7 @@ import (
 
 // 执行shell指令
 func main () {
-    r, err := gproc.ShellExec("sleep 3s; echo 'hello';")
-    fmt.Println("result:", r, err)
+    r, err := gproc.ShellExec(`sleep 3s; echo "hello gf!";`)
+    fmt.Println("result:", r)
+    fmt.Println(err)
 }
diff --git a/geg/other/test.go b/geg/other/test.go
index db073169d..14847be34 100644
--- a/geg/other/test.go
+++ b/geg/other/test.go
@@ -2,10 +2,13 @@ package main
 
 import (
     "fmt"
-    "gitee.com/johng/gf/g/os/gfile"
-    "gitee.com/johng/gf/g/os/gtime"
 )
 
-func main() {
-    fmt.Println(gtime.NewFromTimeStamp(gfile.MTime("/home/john/Documents/temp")).String())
+func test() {
+    defer fmt.Println(1)
+    fmt.Println(2)
+}
+
+func main() {
+    test()
 }
diff --git a/geg/util/gregex/gregex.go b/geg/util/gregex/gregex.go
new file mode 100644
index 000000000..2eebd54de
--- /dev/null
+++ b/geg/util/gregex/gregex.go
@@ -0,0 +1,11 @@
+package main
+
+import (
+    "fmt"
+    "gitee.com/johng/gf/g/util/gregex"
+)
+
+func main() {
+    match, _ := gregex.MatchString(`(\w+).+\-\-\s*(.+)`, `GF is best! -- John`)
+    fmt.Printf(`%s says "%s" is the one he loves!`, match[2], match[1])
+}