diff --git a/examples/input_and_compute.ltor b/examples/input_and_compute.ltor
index ba62740..8fcaad8 100644
--- a/examples/input_and_compute.ltor
+++ b/examples/input_and_compute.ltor
@@ -3,4 +3,4 @@ set a to input_number()
 set b to input_number()
 set res to a+b
 
-eval print_int(c)
+print_int(res)
diff --git a/examples/print_42.ltor b/examples/print_42.ltor
index 308a9ce..b05e0cc 100644
--- a/examples/print_42.ltor
+++ b/examples/print_42.ltor
@@ -1,2 +1,3 @@
 # just print 42
-eval print_number(42)
+print_number(42)
+
diff --git a/examples/sequence.ltor b/examples/sequence.ltor
new file mode 100644
index 0000000..b70df13
--- /dev/null
+++ b/examples/sequence.ltor
@@ -0,0 +1,5 @@
+set i to 0
+while !(i = 10) do
+    print_number(i)
+    set i to i+1
+end
diff --git a/src/config.h b/src/config.h
new file mode 100644
index 0000000..ab3e764
--- /dev/null
+++ b/src/config.h
@@ -0,0 +1,6 @@
+#ifndef G_CONFIG_H_
+#define G_CONFIG_H_
+
+#define G_DEBUG_LEVEL 0
+
+#endif
\ No newline at end of file
diff --git a/src/evaluator.c b/src/evaluator.c
index 007b9d1..85375c3 100644
--- a/src/evaluator.c
+++ b/src/evaluator.c
@@ -539,7 +539,7 @@ int evaluate(struct StateContainer* state, char* inputStr, int* resultPtr, unsig
             // identify token
             // first try a variable then a func name
             // not a float, check if this is a common function name
-            if (EVALUATOR_DEBUG_LEVEL >= 2) printf("now going to identify token '%s' \n");
+            if (EVALUATOR_DEBUG_LEVEL >= 2) printf("now going to identify token '%s' \n", buff);
             if (EVALUATOR_DEBUG_LEVEL >= 2) var_store_print(state->varStore);
             
             int varKey = (int) var_store_get_key(state->varStore, buff);
diff --git a/src/funcs.c b/src/funcs.c
index ac64897..67f0d52 100644
--- a/src/funcs.c
+++ b/src/funcs.c
@@ -2,6 +2,7 @@
 #include <string.h>
 #include <time.h>
 #include <stdlib.h>
+#include "./config.h"
 #include "./types.h"
 #include "./utils.h"
 
@@ -246,7 +247,7 @@ int execute_func(short funcID, short argsLen, unsigned char* argsTypes, int* arg
         return 1;
     }
     char* name = intros[funcID].name;
-    printf("Executing func '%s' \n", name);
+    if (G_DEBUG_LEVEL >= 2) printf("Executing func '%s' \n", name);
     if (argsLen < intros[funcID].nbArgs) {
         printf("ERR: Too few arguments for func call '%s' \n", name);
         return 1;
@@ -260,7 +261,7 @@ int execute_func(short funcID, short argsLen, unsigned char* argsTypes, int* arg
     // first cast the function ptr
     impl(resPtr, resTypePtr, argsTypes, argsValues);
 
-    printf("Got %s \n", get_repr(*resTypePtr, resPtr));
+    if (G_DEBUG_LEVEL >= 2) printf("Got %s \n", get_repr(*resTypePtr, resPtr));
 
     return 0;
 }
diff --git a/src/line_processing.c b/src/line_processing.c
index 60baa43..16cc9f3 100644
--- a/src/line_processing.c
+++ b/src/line_processing.c
@@ -432,7 +432,7 @@ int process_line(struct StateContainer* state, char* str)
         for (int z = 0; z < nameLen; z++) {
             name[z] = str[setStatementParsing.name_start + z];
         }
-        name[len] = '\0';
+        name[nameLen] = '\0';
 
         int res;
         byte resType;
diff --git a/src/line_processing.h b/src/line_processing.h
index 5fedb35..96e3e7b 100644
--- a/src/line_processing.h
+++ b/src/line_processing.h
@@ -2,7 +2,7 @@
 #ifndef LINE_PROCESSING_H_
 #define LINE_PROCESSING_H_
 
-#define LINE_PROCESSING_DEBUG_LEVEL 1
+#define LINE_PROCESSING_DEBUG_LEVEL 0
 
 #define BLOCK_IF 2
 #define BLOCK_WHILE 3
diff --git a/src/main.c b/src/main.c
index 98c5510..38a06e9 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,45 +1,114 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include "./config.h"
+#include "./types.h"
+#include "./utils.h"
 #include "./stack.h"
 #include "./list.h"
 #include "./number_parsing.h"
 #include "./evaluator.h"
-#include "./utils.h"
-#include "./types.h"
+#include "./state.h"
+#include "./var_store.h"
 #include "./line_processing.h"
 
-byte load_file(char* filename, char** resultPtr) {
-    FILE* f = fopen(filename, "rb");
+#define HELP_FLAG        1
+#define VERSION_FLAG     4
+#define INTERACTIVE_FLAG 8
+#define STDIN_EXP_FLAG   16
+
+int help_mode() {
+    char* helpStr = "Usage: langatator [options] [file]\n"
+        "  -h  --help              print this usage and exit\n"
+        "  -v  --version           print version information and exit\n"
+        "  -i  --interactive       force interactive mode\n"
+        "  -e  --stdin-expression  evaluate expression from stdin\n";
+    printf(helpStr);
+    return 0;
+}
+
+int version_mode() {
+    char* helpStr = "Langatator 0.0.1\n";
+    printf(helpStr);
+    return 0;
+}
+
+int interactive_mode() {
+    printf("Interactive not implemented yet ¯\\_(ツ)_/¯ \n");
+    return 1;
+}
+
+int stdin_expression_mode() {
+    printf("This mode is not implemented yet ¯\\_(ツ)_/¯ \n");
+    return 1;
+}
+
+int file_mode(char* fileName) {
+    FILE* f = fopen(fileName, "rb");
 
     if (!f) {
-        return 0;
+        printf(stderr, "Cannot load file '%s' status: %d\n", fileName, f);
+        return 1;
     }
     fseek(f, 0, SEEK_END);
     long length = ftell(f);
-    fseek (f, 0, SEEK_SET);
-    char* buffer = (char*) malloc(length);
-    if (!buffer) {
-        return 0;
+    fseek(f, 0, SEEK_SET);
+
+    char* buff = (char*) malloc(length);
+    if (!buff) {
+        printf(stderr, "Could not allocate buffer to process file content\n");
+        return 1;
     }
-    if (buffer) {
-        fread(buffer, 1, length, f);
+    if (buff) {
+        fread(buff, 1, length, f);
     }
     fclose(f);
     
-    *resultPtr = buffer;
+    struct StateContainer* state = state_init();
+    process_script(state, buff);
 
-    return 1;
+    return 0;
 }
 
 int main (int argc, char** argv) {
-    // if (argc == 1) {
-    //     printf("One arg '%s'", argv[0]);
+    int flags = INTERACTIVE_FLAG;
 
-    //     return 0;
-    // }
+    int nonFlagArgumentCount = 0;
+    int nonFlagArgumentPos = 0;
 
-    // printf("Invalid usage use --help to document your self\n");
-    printf("CLI not implemented yet ¯\\_(ツ)_/¯ \n");
+    char* cmdName = argv[0];
+    for (int i = 1; i < argc; i++) {
+        if (str_starts_with("--help", argv[i]) || str_starts_with("-h", argv[i])) {
+            flags = HELP_FLAG;
+            break;
+        }
+        if (str_starts_with("--version", argv[i]) || str_starts_with("-v", argv[i])) {
+            flags = VERSION_FLAG;
+            break;
+        }
+        if (str_starts_with("--interactive", argv[i]) || str_starts_with("-i", argv[i])) {
+            flags = INTERACTIVE_FLAG;
+            break;
+        }
+        if (str_starts_with("--stdin-expression", argv[i]) || str_starts_with("-e", argv[i])) {
+            flags = STDIN_EXP_FLAG;
+            break;
+        }
+        // no flag match
+        if (str_starts_with("--", argv[i])) {
+            printf(stderr, "Invalid flag '%s'\n", argv[i]);
+            return 1;
+        }
+        nonFlagArgumentCount++;
+        nonFlagArgumentPos = i;
+    }
+    if (nonFlagArgumentCount == 1) return file_mode(argv[nonFlagArgumentPos]);
+
+    if (flags & HELP_FLAG) return help_mode();
+    if (flags & VERSION_FLAG) return version_mode();
+    if (flags & INTERACTIVE_FLAG) return interactive_mode();
+    if (flags & STDIN_EXP_FLAG) return stdin_expression_mode();
+
+    help_mode();
     return 1;
 }
diff --git a/src/utils.h b/src/utils.h
index 5d4320c..e8134ee 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -1,3 +1,5 @@
+#include "./config.h"
+
 #ifndef UTILS_H_
 #define UTILS_H_
 
diff --git a/src/var_store.h b/src/var_store.h
index ee18725..9140390 100644
--- a/src/var_store.h
+++ b/src/var_store.h
@@ -61,4 +61,6 @@ byte var_store_set(struct VariableStore* store, char* varName, byte type, void*
 
 byte var_store_delete(struct VariableStore* store, char* varName);
 
+void var_store_print(struct VariableStore* store);
+
 #endif