diff --git a/DownloadDCJsonFiles.pro b/DownloadDCJsonFiles.pro
index 340b0ce..372518b 100644
--- a/DownloadDCJsonFiles.pro
+++ b/DownloadDCJsonFiles.pro
@@ -67,11 +67,13 @@ contains( CONFIG, DesktopLinux ) {
 
 SOURCES += \
         main.cpp \
-        message_handler.cpp
+        message_handler.cpp \
+        process/command.cpp
 
 HEADERS += \
         message_handler.h \
-        plugins/interfaces.h
+        plugins/interfaces.h \
+        process/command.h
 
 OTHER_FILES += \
     ATBDownloadDCJsonFiles.ini
diff --git a/main.cpp b/main.cpp
index dd8d104..b6db3d0 100644
--- a/main.cpp
+++ b/main.cpp
@@ -7,10 +7,8 @@
 #include "plugins/interfaces.h"
 
 
-#if defined (__unix__) || defined (__linux__)
-#include <unistd.h>
-#include <errno.h>
-#endif
+//#include <unistd.h>
+//#include <errno.h>
 
 #ifdef PTU5
 #define SERIAL_PORT "ttymxc2"
@@ -36,5 +34,23 @@ int main(int argc, char **argv) {
         setDebugLevel(LOG_NOTICE);
     }
 
+    int r = std::system("ls -l /proc/[0-9]*/fd/* 2>/dev/null | grep /dev/ttymxc2 > /tmp/slave-or-master.txt");
+    // lrwx------    1 root     root            64 Oct 31 14:55 /proc/884/fd/18 -> /dev/ttymxc2
+
+    //std::ifstream ifs("/tmp/slave-or-master.txt");
+
+    //if (ifs.is_open()) {
+    //    std::string line;
+    //    if (std::getline(ifs, line)) {
+    //        if (line.size() > 0) {
+    //            std::cout << "SLAVE " << line << std::endl;
+    //        }
+    //    } else {
+    //    }
+
+    //    ifs.close();
+
+    //}
+
     return a.exec();
 }
diff --git a/process/command.h b/process/command.h
index bc796ee..372e293 100644
--- a/process/command.h
+++ b/process/command.h
@@ -1,6 +1,5 @@
 #ifndef COMMAND_H_INCLUDED
 #define COMMAND_H_INCLUDED
-#endif // COMMAND_H_INCLUDED
 
 #include <QObject>
 #include <QCoreApplication>
@@ -33,3 +32,5 @@ private slots:
     void readyReadStandardError();
     void finished(int exitCode, QProcess::ExitStatus exitStatus);
 };
+
+#endif // COMMAND_H_INCLUDED