diff --git a/paddle/fluid/framework/CMakeLists.txt b/paddle/fluid/framework/CMakeLists.txt
index 2e5380afbcec41c1b51eecbd3663b4a329e07f40..5d4d0ad4b775b8d2fde71d380b9f24019d08c524 100644
--- a/paddle/fluid/framework/CMakeLists.txt
+++ b/paddle/fluid/framework/CMakeLists.txt
@@ -23,11 +23,9 @@ endfunction()
 
 add_subdirectory(ir)
 add_subdirectory(details)
-<<<<<<< HEAD
 add_subdirectory(fleet)
-=======
 add_subdirectory(common)
->>>>>>> add fs_local_open example
+add_subdirectory(io)
 #ddim lib
 proto_library(framework_proto SRCS framework.proto)
 proto_library(async_executor_proto SRCS data_feed.proto)
diff --git a/paddle/fluid/framework/async_executor.cc b/paddle/fluid/framework/async_executor.cc
index 9d8246d71370fa513b3f2b3761a27bace8a3b39f..67770f77c2fc3b4b7f6141f7813c5f55b9c94796 100644
--- a/paddle/fluid/framework/async_executor.cc
+++ b/paddle/fluid/framework/async_executor.cc
@@ -18,8 +18,6 @@ limitations under the License. */
 #include "google/protobuf/text_format.h"
 
 #include "gflags/gflags.h"
-#include "paddle/fluid/framework/common/fs.h"
-#include "paddle/fluid/framework/common/shell.h"
 #include "paddle/fluid/framework/data_feed_factory.h"
 #include "paddle/fluid/framework/executor_thread_worker.h"
 #include "paddle/fluid/framework/feed_fetch_method.h"
diff --git a/paddle/fluid/framework/data_feed.cc b/paddle/fluid/framework/data_feed.cc
index e37e596565470cc8f2daad278b6668ee91d615cc..36ce3debc301c0010436c12892fc746ee14cb4b4 100644
--- a/paddle/fluid/framework/data_feed.cc
+++ b/paddle/fluid/framework/data_feed.cc
@@ -12,15 +12,14 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License. */
 
+#include "paddle/fluid/framework/data_feed.h"
 #include <stdio_ext.h>
+#include "gflags/gflags.h"
 #include "google/protobuf/io/zero_copy_stream_impl.h"
 #include "google/protobuf/message.h"
 #include "google/protobuf/text_format.h"
-
-#include "common/fs.h"
-#include "common/shell.h"
-#include "gflags/gflags.h"
-#include "paddle/fluid/framework/data_feed.h"
+#include "io/fs.h"
+#include "io/shell.h"
 #include "paddle/fluid/framework/feed_fetch_method.h"
 #include "paddle/fluid/framework/feed_fetch_type.h"
 
@@ -94,24 +93,8 @@ void PrivateQueueDataFeed<T>::SetQueueSize(int queue_size) {
 template <typename T>
 bool PrivateQueueDataFeed<T>::Start() {
   CheckSetFileList();
-  std::string filename;
-  if (PickOneFile(&filename)) {
-    int err_no = 0;
-    std::string pipeline_cmd = "cat";
-
-    std::string path =
-        "/home/users/dongdaxiang/pslib_ctr/local/data_mod/part-00012";
-    fp_ = fs_open_read(path, &err_no, pipeline_cmd);
-    __fsetlocking(&*fp_, FSETLOCKING_BYCALLER);
-    thread_local LineFileReader reader;
-    while (reader.getline(&*(fp_.get()))) {
-      LOG(ERROR) << "read a line";
-    }
-
-    read_thread_ = std::thread(&PrivateQueueDataFeed::ReadThread, this);
-    read_thread_.detach();
-  }
-  queue_->Close();
+  read_thread_ = std::thread(&PrivateQueueDataFeed::ReadThread, this);
+  read_thread_.detach();
 
   finish_start_ = true;
   return true;
@@ -119,10 +102,18 @@ bool PrivateQueueDataFeed<T>::Start() {
 
 template <typename T>
 void PrivateQueueDataFeed<T>::ReadThread() {
-  T instance;
-  while (ParseOneInstanceFromPipe(&instance)) {
-    queue_->Send(instance);
+  std::string filename;
+  while (PickOneFile(&filename)) {
+    int err_no = 0;
+    fp_ = fs_open_read(filename, &err_no, pipe_command_);
+    __fsetlocking(&*fp_, FSETLOCKING_BYCALLER);
+    thread_local string::LineFileReader reader;
+    T instance;
+    while (ParseOneInstanceFromPipe(&instance)) {
+      queue_->Send(instance);
+    }
   }
+  queue_->Close();
 }
 
 template <typename T>
@@ -177,15 +168,26 @@ void MultiSlotDataFeed::Init(
     }
   }
   feed_vec_.resize(use_slots_.size());
+  pipe_command_ = data_feed_desc.pipe_command();
   finish_init_ = true;
 }
 
 void MultiSlotDataFeed::ReadThread() {
-  LOG(ERROR) << "Haha";
-  std::vector<MultiSlotType> instance;
-  while (ParseOneInstanceFromPipe(&instance)) {
-    queue_->Send(instance);
+  std::string filename;
+  while (PickOneFile(&filename)) {
+    int err_no = 0;
+    fp_ = fs_open_read(filename, &err_no, pipe_command_);
+    __fsetlocking(&*fp_, FSETLOCKING_BYCALLER);
+    thread_local string::LineFileReader reader;
+    std::vector<MultiSlotType> instance;
+    int ins_num = 0;
+    while (ParseOneInstanceFromPipe(&instance)) {
+      ins_num++;
+      queue_->Send(instance);
+    }
+    LOG(ERROR) << "filename: " << filename << " inst num: " << ins_num;
   }
+  queue_->Close();
 }
 
 bool MultiSlotDataFeed::CheckFile(const char* filename) {
@@ -301,26 +303,32 @@ bool MultiSlotDataFeed::CheckFile(const char* filename) {
 
 bool MultiSlotDataFeed::ParseOneInstanceFromPipe(
     std::vector<MultiSlotType>* instance) {
-  LOG(ERROR) << "hehe";
-  thread_local LineFileReader reader;
+  thread_local string::LineFileReader reader;
+  /*
   while (reader.getline(&*(fp_.get()))) {
-    /*
+  */
+  /*
     const char* str = reader.get();
     std::string line = std::string(str);
     LOG(ERROR) << line;
-    */
+  */
+  /*
     LOG(ERROR) << "read a line";
   }
-  return true;
-  /*
-  if (!reader.getline(fp_.get())) {
+  */
+
+  if (!reader.getline(&*(fp_.get()))) {
     return false;
   } else {
     // std::string& line = reader_.get();
     // const char* str = line.c_str();
+
+    int use_slots_num = use_slots_.size();
+    instance->resize(use_slots_num);
+
     const char* str = reader.get();
     std::string line = std::string(str);
-    LOG(ERROR) << line;
+    // LOG(ERROR) << line;
     char* endptr = const_cast<char*>(str);
     int pos = 0;
     for (size_t i = 0; i < use_slots_index_.size(); ++i) {
@@ -355,7 +363,6 @@ bool MultiSlotDataFeed::ParseOneInstanceFromPipe(
     }
     return true;
   }
-  */
 }
 
 bool MultiSlotDataFeed::ParseOneInstance(std::vector<MultiSlotType>* instance) {
diff --git a/paddle/fluid/framework/data_feed.h b/paddle/fluid/framework/data_feed.h
index de0289e4d2489b15454cd7eb4958466dd79d9355..59ad90afe1fe88e0ef034594e11a3cf07fca8ad7 100644
--- a/paddle/fluid/framework/data_feed.h
+++ b/paddle/fluid/framework/data_feed.h
@@ -21,12 +21,12 @@ limitations under the License. */
 #include <thread>  // NOLINT
 #include <vector>
 
-#include "paddle/fluid/framework/common/ps_string.h"
 #include "paddle/fluid/framework/data_feed.pb.h"
 #include "paddle/fluid/framework/lod_tensor.h"
 #include "paddle/fluid/framework/reader.h"
 #include "paddle/fluid/framework/variable.h"
 #include "paddle/fluid/operators/reader/blocking_queue.h"
+#include "paddle/fluid/string/string_helper.h"
 
 namespace paddle {
 namespace framework {
@@ -115,6 +115,7 @@ class DataFeed {
   bool finish_init_;
   static bool finish_set_filelist_;
   bool finish_start_;
+  std::string pipe_command_;
 };
 
 // PrivateQueueDataFeed is the base virtual class for ohther DataFeeds.
@@ -154,7 +155,7 @@ class PrivateQueueDataFeed : public DataFeed {
   std::ifstream file_;
   std::shared_ptr<FILE> fp_;
   size_t queue_size_;
-  LineFileReader reader_;
+  string::LineFileReader reader_;
   // The queue for store parsed data
   std::unique_ptr<paddle::operators::reader::BlockingQueue<T>> queue_;
 };
diff --git a/paddle/fluid/framework/data_feed.proto b/paddle/fluid/framework/data_feed.proto
index 489fec08d86ccf61ece29bbba6d0204f25530b0f..b13c908b37cd7407c8e5473f8fcd21c92084675d 100644
--- a/paddle/fluid/framework/data_feed.proto
+++ b/paddle/fluid/framework/data_feed.proto
@@ -27,4 +27,5 @@ message DataFeedDesc {
   optional string name = 1;
   optional int32 batch_size = 2 [ default = 32 ];
   optional MultiSlotDesc multi_slot_desc = 3;
+  optional string pipe_command = 4;
 }
diff --git a/paddle/fluid/framework/executor_thread_worker.cc b/paddle/fluid/framework/executor_thread_worker.cc
index efa148a6b50e6d78958acdf8d6fcaa7f32bb3129..d03eeb9e9d8352e9921e654791604496177d1c20 100644
--- a/paddle/fluid/framework/executor_thread_worker.cc
+++ b/paddle/fluid/framework/executor_thread_worker.cc
@@ -13,15 +13,12 @@ See the License for the specific language governing permissions and
 limitations under the License. */
 
 #include "paddle/fluid/framework/executor_thread_worker.h"
-#include <stdio_ext.h>
 #include <algorithm>
 #include "google/protobuf/io/zero_copy_stream_impl.h"
 #include "google/protobuf/message.h"
 #include "google/protobuf/text_format.h"
 
 #include "gflags/gflags.h"
-#include "paddle/fluid/framework/common/fs.h"
-#include "paddle/fluid/framework/common/shell.h"
 #include "paddle/fluid/framework/feed_fetch_method.h"
 #include "paddle/fluid/framework/feed_fetch_type.h"
 #include "paddle/fluid/framework/lod_rank_table.h"
@@ -247,8 +244,7 @@ void ExecutorThreadWorker::TrainFilesWithTimer() {
   platform::SetNumThreads(1);
   SetDevice();
   thread_reader_->Start();
-  exit(0);
-  /*
+
   std::vector<double> op_total_time;
   std::vector<std::string> op_name;
   for (auto& op : ops_) {
@@ -292,7 +288,6 @@ void ExecutorThreadWorker::TrainFilesWithTimer() {
     }
     timeline.Start();
   }
-  */
 }
 
 void ExecutorThreadWorker::TrainFiles() {
diff --git a/paddle/fluid/framework/common/CMakeLists.txt b/paddle/fluid/framework/io/CMakeLists.txt
similarity index 100%
rename from paddle/fluid/framework/common/CMakeLists.txt
rename to paddle/fluid/framework/io/CMakeLists.txt
diff --git a/paddle/fluid/framework/common/fs.cc b/paddle/fluid/framework/io/fs.cc
similarity index 81%
rename from paddle/fluid/framework/common/fs.cc
rename to paddle/fluid/framework/io/fs.cc
index 62db2a2bd0b8e67b4096bcf57e4c5043373d7cad..a4f2d2a89a4fb262776b535f264555761ef52a0c 100644
--- a/paddle/fluid/framework/common/fs.cc
+++ b/paddle/fluid/framework/io/fs.cc
@@ -12,7 +12,7 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License. */
 
-#include "paddle/fluid/framework/common/fs.h"
+#include "paddle/fluid/framework/io/fs.h"
 
 namespace paddle {
 namespace framework {
@@ -25,10 +25,11 @@ static void fs_add_read_converter_internal(std::string& path,  // NOLINT
   }
 
   if (!is_pipe) {
-    path = format_string("( %s ) < \"%s\"", converter.c_str(), path.c_str());
+    path = string::format_string("( %s ) < \"%s\"", converter.c_str(),
+                                 path.c_str());
     is_pipe = true;
   } else {
-    path = format_string("%s | %s", path.c_str(), converter.c_str());
+    path = string::format_string("%s | %s", path.c_str(), converter.c_str());
   }
 }
 
@@ -40,10 +41,11 @@ static void fs_add_write_converter_internal(std::string& path,  // NOLINT
   }
 
   if (!is_pipe) {
-    path = format_string("( %s ) > \"%s\"", converter.c_str(), path.c_str());
+    path = string::format_string("( %s ) > \"%s\"", converter.c_str(),
+                                 path.c_str());
     is_pipe = true;
   } else {
-    path = format_string("%s | %s", converter.c_str(), path.c_str());
+    path = string::format_string("%s | %s", converter.c_str(), path.c_str());
   }
 }
 
@@ -108,7 +110,8 @@ std::shared_ptr<FILE> localfs_open_read(std::string path,
 
 std::shared_ptr<FILE> localfs_open_write(std::string path,
                                          const std::string& converter) {
-  shell_execute(format_string("mkdir -p $(dirname \"%s\")", path.c_str()));
+  shell_execute(
+      string::format_string("mkdir -p $(dirname \"%s\")", path.c_str()));
 
   bool is_pipe = false;
 
@@ -134,7 +137,7 @@ void localfs_remove(const std::string& path) {
     return;
   }
 
-  shell_execute(format_string("rm -rf %s", path.c_str()));
+  shell_execute(string::format_string("rm -rf %s", path.c_str()));
 }
 
 std::vector<std::string> localfs_list(const std::string& path) {
@@ -144,9 +147,10 @@ std::vector<std::string> localfs_list(const std::string& path) {
 
   std::shared_ptr<FILE> pipe;
   int err_no = 0;
-  pipe = shell_popen(format_string("find %s -type f -maxdepth 1", path.c_str()),
-                     "r", &err_no);
-  LineFileReader reader;
+  pipe = shell_popen(
+      string::format_string("find %s -type f -maxdepth 1", path.c_str()), "r",
+      &err_no);
+  string::LineFileReader reader;
   std::vector<std::string> list;
 
   while (reader.getline(&*pipe)) {
@@ -161,21 +165,22 @@ std::string localfs_tail(const std::string& path) {
     return "";
   }
 
-  return shell_get_command_output(format_string("tail -1 %s ", path.c_str()));
+  return shell_get_command_output(
+      string::format_string("tail -1 %s ", path.c_str()));
 }
 
 bool localfs_exists(const std::string& path) {
   std::string test_f = shell_get_command_output(
-      format_string("[ -f %s ] ; echo $?", path.c_str()));
+      string::format_string("[ -f %s ] ; echo $?", path.c_str()));
 
-  if (trim_spaces(test_f) == "0") {
+  if (string::trim_spaces(test_f) == "0") {
     return true;
   }
 
   std::string test_d = shell_get_command_output(
-      format_string("[ -d %s ] ; echo $?", path.c_str()));
+      string::format_string("[ -d %s ] ; echo $?", path.c_str()));
 
-  if (trim_spaces(test_d) == "0") {
+  if (string::trim_spaces(test_d) == "0") {
     return true;
   }
 
@@ -187,7 +192,7 @@ void localfs_mkdir(const std::string& path) {
     return;
   }
 
-  shell_execute(format_string("mkdir -p %s", path.c_str()));
+  shell_execute(string::format_string("mkdir -p %s", path.c_str()));
 }
 
 static size_t& hdfs_buffer_size_internal() {
@@ -211,11 +216,11 @@ void hdfs_set_command(const std::string& x) { hdfs_command_internal() = x; }
 std::shared_ptr<FILE> hdfs_open_read(std::string path, int* err_no,
                                      const std::string& converter) {
   if (fs_end_with_internal(path, ".gz")) {
-    path =
-        format_string("%s -text \"%s\"", hdfs_command().c_str(), path.c_str());
+    path = string::format_string("%s -text \"%s\"", hdfs_command().c_str(),
+                                 path.c_str());
   } else {
-    path =
-        format_string("%s -cat \"%s\"", hdfs_command().c_str(), path.c_str());
+    path = string::format_string("%s -cat \"%s\"", hdfs_command().c_str(),
+                                 path.c_str());
   }
 
   bool is_pipe = true;
@@ -225,8 +230,8 @@ std::shared_ptr<FILE> hdfs_open_read(std::string path, int* err_no,
 
 std::shared_ptr<FILE> hdfs_open_write(std::string path, int* err_no,
                                       const std::string& converter) {
-  path =
-      format_string("%s -put - \"%s\"", hdfs_command().c_str(), path.c_str());
+  path = string::format_string("%s -put - \"%s\"", hdfs_command().c_str(),
+                               path.c_str());
   bool is_pipe = true;
 
   if (fs_end_with_internal(path, ".gz\"")) {
@@ -242,8 +247,8 @@ void hdfs_remove(const std::string& path) {
     return;
   }
 
-  shell_execute(format_string("%s -rmr %s &>/dev/null; true",
-                              hdfs_command().c_str(), path.c_str()));
+  shell_execute(string::format_string("%s -rmr %s &>/dev/null; true",
+                                      hdfs_command().c_str(), path.c_str()));
 }
 
 std::vector<std::string> hdfs_list(const std::string& path) {
@@ -261,14 +266,15 @@ std::vector<std::string> hdfs_list(const std::string& path) {
   do {
     err_no = 0;
     std::shared_ptr<FILE> pipe;
-    pipe = shell_popen(format_string("%s -ls %s | ( grep ^- ; [ $? != 2 ] )",
-                                     hdfs_command().c_str(), path.c_str()),
-                       "r", &err_no);
-    LineFileReader reader;
+    pipe = shell_popen(
+        string::format_string("%s -ls %s | ( grep ^- ; [ $? != 2 ] )",
+                              hdfs_command().c_str(), path.c_str()),
+        "r", &err_no);
+    string::LineFileReader reader;
     list.clear();
 
     while (reader.getline(&*pipe)) {
-      std::vector<std::string> line = split_string(reader.get());
+      std::vector<std::string> line = string::split_string(reader.get());
       if (line.size() != 8) {
         continue;
       }
@@ -283,15 +289,15 @@ std::string hdfs_tail(const std::string& path) {
     return "";
   }
 
-  return shell_get_command_output(format_string(
+  return shell_get_command_output(string::format_string(
       "%s -text %s | tail -1 ", hdfs_command().c_str(), path.c_str()));
 }
 
 bool hdfs_exists(const std::string& path) {
-  std::string test = shell_get_command_output(format_string(
+  std::string test = shell_get_command_output(string::format_string(
       "%s -test -e %s ; echo $?", hdfs_command().c_str(), path.c_str()));
 
-  if (trim_spaces(test) == "0") {
+  if (string::trim_spaces(test) == "0") {
     return true;
   }
 
@@ -303,8 +309,8 @@ void hdfs_mkdir(const std::string& path) {
     return;
   }
 
-  shell_execute(format_string("%s -mkdir %s; true", hdfs_command().c_str(),
-                              path.c_str()));
+  shell_execute(string::format_string("%s -mkdir %s; true",
+                                      hdfs_command().c_str(), path.c_str()));
 }
 
 int fs_select_internal(const std::string& path) {
@@ -445,5 +451,5 @@ void fs_mkdir(const std::string& path) {
       LOG(FATAL) << "Not supported";
   }
 }
-}  // namespace framework
-}  // namespace paddle
+}  // end namespace framework
+}  // end namespace paddle
diff --git a/paddle/fluid/framework/common/fs.h b/paddle/fluid/framework/io/fs.h
similarity index 96%
rename from paddle/fluid/framework/common/fs.h
rename to paddle/fluid/framework/io/fs.h
index 66429482cc1e0d68a3bd1638804d06e23e8fe248..f08953552c5597a750a05de5ff7f3c8c77fd1f67 100644
--- a/paddle/fluid/framework/common/fs.h
+++ b/paddle/fluid/framework/io/fs.h
@@ -18,8 +18,8 @@
 #include <string>
 #include <vector>
 #include "glog/logging.h"
-#include "paddle/fluid/framework/common/ps_string.h"
-#include "paddle/fluid/framework/common/shell.h"
+#include "paddle/fluid/framework/io/shell.h"
+#include "paddle/fluid/string/string_helper.h"
 
 namespace paddle {
 namespace framework {
diff --git a/paddle/fluid/framework/common/shell.cc b/paddle/fluid/framework/io/shell.cc
similarity index 98%
rename from paddle/fluid/framework/common/shell.cc
rename to paddle/fluid/framework/io/shell.cc
index ff6e828aa1578e33c0fbe53ca90eadf18f53e3b2..286f48f6f177787c1a0e543e1a0c17a9680d88a8 100644
--- a/paddle/fluid/framework/common/shell.cc
+++ b/paddle/fluid/framework/io/shell.cc
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include "paddle/fluid/framework/common/shell.h"
+#include "paddle/fluid/framework/io/shell.h"
 
 namespace paddle {
 namespace framework {
@@ -282,7 +282,7 @@ std::string shell_get_command_output(const std::string& cmd) {
   do {
     err_no = 0;
     std::shared_ptr<FILE> pipe = shell_popen(cmd, "r", &err_no);
-    LineFileReader reader;
+    string::LineFileReader reader;
 
     if (reader.getdelim(&*pipe, 0)) {
       pipe = nullptr;
@@ -294,5 +294,5 @@ std::string shell_get_command_output(const std::string& cmd) {
 
   return "";
 }
-}  // namespace framework
-}  // namespace paddle
+}  // end namespace framework
+}  // end namespace paddle
diff --git a/paddle/fluid/framework/common/shell.h b/paddle/fluid/framework/io/shell.h
similarity index 97%
rename from paddle/fluid/framework/common/shell.h
rename to paddle/fluid/framework/io/shell.h
index 41ef3a9957679edc7e940d91da1a9cf769a12af0..effaa1e99ed477bd1667b3237faed2824967911b 100644
--- a/paddle/fluid/framework/common/shell.h
+++ b/paddle/fluid/framework/io/shell.h
@@ -23,7 +23,7 @@
 #include <string>
 #include <utility>
 #include "glog/logging.h"
-#include "paddle/fluid/framework/common/ps_string.h"
+#include "paddle/fluid/string/string_helper.h"
 
 namespace paddle {
 namespace framework {
diff --git a/paddle/fluid/framework/common/ps_string.h b/paddle/fluid/string/string_helper.h
similarity index 99%
rename from paddle/fluid/framework/common/ps_string.h
rename to paddle/fluid/string/string_helper.h
index 6de9b7be32468445373a63369a25d79b73f92714..48af332bb816b4fe51b86cc8c21ef62db2292f1e 100644
--- a/paddle/fluid/framework/common/ps_string.h
+++ b/paddle/fluid/string/string_helper.h
@@ -23,7 +23,7 @@
 #include "glog/logging.h"
 
 namespace paddle {
-namespace framework {
+namespace string {
 
 inline size_t count_spaces(const char* s) {
   size_t count = 0;
@@ -234,5 +234,5 @@ class LineFileReader {
   size_t _buf_size = 0;
   size_t _length = 0;
 };
-}  // end namespace framework
+}  // end namespace string
 }  // end namespace paddle
diff --git a/python/paddle/fluid/data_feed_desc.py b/python/paddle/fluid/data_feed_desc.py
index d2ec74d6cfdeb34c1f48c086a3aa30d5100c3efb..2770c0209e15dc07033984e1a8fb95db29039819 100644
--- a/python/paddle/fluid/data_feed_desc.py
+++ b/python/paddle/fluid/data_feed_desc.py
@@ -114,6 +114,24 @@ class DataFeedDesc(object):
             self.proto_desc.multi_slot_desc.slots[self.__name_to_index[
                 name]].is_dense = True
 
+    def set_pipe_command(self, pipe_command):
+        """
+        Pipeline command will be set with this function. In IO runtime, 
+        pipeline command will be executed given user provided input raw
+        files.
+
+        Example:
+            >>> data_feed = fluid.DataFeedDesc('data.proto')
+            >>> data_feed.set_pipe_command('awk -F '\t' '{print $2}'')
+
+        Args:
+            pipe_command: a command string of shell command
+        
+        Note:
+            Default is cat, i.e., cat user's input file list to data feed
+        """
+        self.proto_desc.pipe_command = pipe_command
+
     def set_use_slots(self, use_slots_name):
         """
         Set if a specific slot will be used for training. A dataset shall