diff --git a/configure.ac b/configure.ac
index 7919ec5..07ef420 100644
--- a/configure.ac
+++ b/configure.ac
@@ -17,6 +17,13 @@
 PKG_CHECK_MODULES([SDEVENTPLUS], [sdeventplus])
 PKG_CHECK_MODULES([PHOSPHOR_LOGGING], [phosphor-logging])
 
+# We need the header only CLI library
+AC_CHECK_HEADERS(
+    [CLI/CLI.hpp],
+    [],
+    [AC_MSG_ERROR([Could not find CLI11 CLI/CLI.hpp])]
+)
+
 # Checks for typedefs, structures, and compiler characteristics.
 AX_CXX_COMPILE_STDCXX_17([noext])
 AX_APPEND_COMPILE_FLAGS([-Wall -Werror], [CXXFLAGS])
diff --git a/systemd_target_monitor.cpp b/systemd_target_monitor.cpp
index b9af29f..5fa05fa 100644
--- a/systemd_target_monitor.cpp
+++ b/systemd_target_monitor.cpp
@@ -1,13 +1,40 @@
+#include <CLI/CLI.hpp>
+#include <iostream>
+#include <phosphor-logging/log.hpp>
 #include <sdbusplus/bus.hpp>
 #include <sdeventplus/event.hpp>
+#include <vector>
+
+using phosphor::logging::level;
+using phosphor::logging::log;
+
+void print_usage(void)
+{
+    std::cout << "[-f <file1> -f <file2> ...] : Full path to json file(s) with "
+                 "target/error mappings"
+              << std::endl;
+    return;
+}
 
 int main(int argc, char* argv[])
 {
     auto bus = sdbusplus::bus::new_default();
     auto event = sdeventplus::Event::get_default();
     bus.attach_event(event.get(), SD_EVENT_PRIORITY_NORMAL);
+    std::vector<std::string> filePaths;
 
-    // TODO - Process input parameters
+    CLI::App app{"OpenBmc systemd target monitor"};
+    app.add_option("-f,--file", filePaths,
+                   "Full path to json file(s) with target/error mappings");
+
+    CLI11_PARSE(app, argc, argv);
+
+    if (filePaths.empty())
+    {
+        log<level::ERR>("No input files");
+        print_usage();
+        exit(-1);
+    }
 
     // TODO - Load in json config file(s)