diff --git a/src/alogamous/__main__.py b/src/alogamous/__main__.py
index a707de5..17d4274 100644
--- a/src/alogamous/__main__.py
+++ b/src/alogamous/__main__.py
@@ -13,17 +13,24 @@
     warning_analyzer,
 )
 
-if len(sys.argv) != int(sys.argv[1]) + 4:
-    sys.stdout.write(f"Usage: {sys.argv[0]} <NUM_FIELDS> <FIELD_NAME1> <FIELD_NAME2> ... <SEPARATOR> <HEADER_LINE>")
+expected_arg_len = 2
+
+if len(sys.argv) != expected_arg_len:
+    sys.stdout.write(f"Usage: {sys.argv[0]} <LOG_CONFIG>")
+    sys.stdout.write("\nPossible LOG_CONFIGS are:")
+    for key in log_line_parser.LOG_FILE_CONFIGS:
+        sys.stdout.write(f"\n- {key}")
     sys.exit(1)
 
-expected_fields = sys.argv[2 : int(sys.argv[1]) + 2]
 
 with open("../../data/test_output_file.txt", "a") as output_file:
     reader = directory_reader.DirectoryReader("../../data")
-    line_parser = log_line_parser.LogLineParser(
-        expected_fields, sys.argv[int(sys.argv[1]) + 2], sys.argv[int(sys.argv[1]) + 3]
+    expected_fields = list(
+        log_line_parser.LOG_FILE_CONFIGS[sys.argv[1]][log_line_parser.ConfigParameters.EXPECTED_FIELDS]
     )
+    seperator = str(log_line_parser.LOG_FILE_CONFIGS[sys.argv[1]][log_line_parser.ConfigParameters.SEPERATOR])
+    header_line = str(log_line_parser.LOG_FILE_CONFIGS[sys.argv[1]][log_line_parser.ConfigParameters.HEADER_LINE])
+    line_parser = log_line_parser.LogLineParser(expected_fields, seperator, header_line)
     analyzer.analyze_log_stream(
         [
             echo_analyzer.EchoAnalyzer(),
diff --git a/src/alogamous/log_line_parser.py b/src/alogamous/log_line_parser.py
index a63232a..670534a 100644
--- a/src/alogamous/log_line_parser.py
+++ b/src/alogamous/log_line_parser.py
@@ -1,6 +1,21 @@
 from __future__ import annotations
 
 
+class ConfigParameters:
+    EXPECTED_FIELDS = "expected fields"
+    SEPERATOR = "seperator"
+    HEADER_LINE = "header line"
+
+
+LOG_FILE_CONFIGS = {
+    "default": {
+        ConfigParameters.EXPECTED_FIELDS: ["datetime", "source", "level", "message"],
+        ConfigParameters.SEPERATOR: " - ",
+        ConfigParameters.HEADER_LINE: "====================================================",
+    }
+}
+
+
 class LineType:
     HEADER_LINE = "header line"
     LOG_LINE = "log line"