diff --git a/src/fr/devinsy/logar/app/ExtractOption.java b/src/fr/devinsy/logar/app/ExtractOption.java
new file mode 100644
index 0000000..31b5ed0
--- /dev/null
+++ b/src/fr/devinsy/logar/app/ExtractOption.java
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2021 Christian Pierre MOMON <christian@momon.org>
+ * 
+ * This file is part of Logar, simple tool to manage http log files.
+ * 
+ * Logar is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ * 
+ * Logar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Logar.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package fr.devinsy.logar.app;
+
+import org.apache.commons.lang3.StringUtils;
+
+/**
+ * The Enum DryOption.
+ */
+public enum ExtractOption
+{
+    IP,
+    DATETIME,
+    USERAGENT;
+
+    public static ExtractOption of(final String source)
+    {
+        ExtractOption result;
+
+        if (source == null)
+        {
+            result = null;
+        }
+        else
+        {
+            String token = source.toLowerCase().trim();
+            if (StringUtils.equals(token, "ip"))
+            {
+                result = IP;
+            }
+            else if (StringUtils.equals(token, "dateime"))
+            {
+                result = DATETIME;
+            }
+            else if (StringUtils.equals(token, "useragent"))
+            {
+                result = USERAGENT;
+            }
+            else
+            {
+                result = null;
+            }
+        }
+
+        //
+        return result;
+    }
+}
diff --git a/src/fr/devinsy/logar/app/Logar.java b/src/fr/devinsy/logar/app/Logar.java
index 8d2d6de..7338741 100644
--- a/src/fr/devinsy/logar/app/Logar.java
+++ b/src/fr/devinsy/logar/app/Logar.java
@@ -520,18 +520,18 @@ public final class Logar
         else
         {
             Files files = FilesUtils.search(source, LOGFILE_PATTERN).removeHidden().keep(".*access.*").sortByName();
-            System.out.println(files.size());
+            // System.out.println(files.size());
+            System.err.println(files.size());
             for (File file : files)
             {
-                // System.out.println("== Extract userAgent for [" +
-                // file.getName() + "]");
+                System.err.println("== Extract userAgent for [" + file.getName() + "]");
                 try
                 {
                     LineIterator iterator = new LineIterator(file);
                     while (iterator.hasNext())
                     {
                         String line = iterator.next();
-
+                        // System.out.println(line);
                         try
                         {
                             Log log = LogParser.parseAccessLog(line);
@@ -554,7 +554,7 @@ public final class Logar
                                     extract = null;
                             }
 
-                            System.out.println(log.getUserAgent());
+                            System.out.println(extract);
                         }
                         catch (IllegalArgumentException exception)
                         {
@@ -572,8 +572,6 @@ public final class Logar
                     System.err.println("Error with file [" + file.getAbsolutePath() + "]");
                     exception.printStackTrace();
                 }
-
-                LogFile.sortLogFile(file);
             }
         }
     }
diff --git a/src/fr/devinsy/logar/app/log/LogParser.java b/src/fr/devinsy/logar/app/log/LogParser.java
index 3ab9c70..cfe8ef3 100644
--- a/src/fr/devinsy/logar/app/log/LogParser.java
+++ b/src/fr/devinsy/logar/app/log/LogParser.java
@@ -88,7 +88,7 @@ public final class LogParser
         }
         catch (DateTimeParseException exception)
         {
-            throw new IllegalArgumentException("Bad line format (date): " + line);
+            throw new IllegalArgumentException("Bad line format (date): " + line, exception);
         }
 
         //
@@ -144,7 +144,7 @@ public final class LogParser
         }
         catch (DateTimeParseException exception)
         {
-            throw new IllegalArgumentException("Bad line format (date): " + line);
+            throw new IllegalArgumentException("Bad line format (date): " + line, exception);
         }
 
         //