diff --git a/CLI/CLI.c b/CLI/CLI.c
new file mode 100644
index 0000000..050ce30
--- /dev/null
+++ b/CLI/CLI.c
@@ -0,0 +1,157 @@
+#include "CLI.h"
+
+#include <stddef.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "../FIFOBuff/FIFOBuffChar.h"
+
+CLI_lineOutFn CLI_lineOut;
+CMDList_t* CMDList;
+FIFOBuffChar_t* FIFO;
+
+// initilize and register the lineout print function
+bool CLI_init(CLI_lineOutFn lineOut, CMDList_t* cmdList)
+{
+	CLI_lineOut = lineOut;
+	CMDList = cmdList;
+
+	FIFO = FIFOBuffChar_create();
+
+	if (CLI_lineOut != NULL)
+	{
+		(*CLI_lineOut)(">");
+		(*CLI_lineOut)(" ");
+	}
+
+	return true;
+}
+
+bool CLI_deinit()
+{
+	CLI_lineOut = NULL;
+	CMDList = NULL;
+
+	FIFOBuffChar_delete(FIFO);
+	return true;
+}
+
+char* fifoToString(FIFOBuffChar_t* fifo)
+{
+	char* out = malloc(fifo->size + 1);
+	char* write_p = out;
+
+	for (int i = fifo->size; i > 0; i--)
+	{
+		FIFOBuffChar_get(fifo, write_p);
+		write_p++;
+	}
+
+	*write_p = 0;
+
+	return out;
+}
+
+int tryExecute(FIFOBuffChar_t* fifo)
+{
+	char* line = fifoToString(fifo);
+	CMD_t* cmd = CMDList_get(CMDList, line);
+	
+	if (cmd != NULL)
+	{
+		(*(cmd->fn))(line);
+
+		if (CLI_lineOut != NULL)
+		{
+			(*CLI_lineOut)(">");
+			(*CLI_lineOut)(" ");
+		}
+		return true;
+	}
+	else
+	{
+		if (CLI_lineOut != NULL)
+		{
+			char err[100];
+			sprintf(&err[0], "command not found: %s\n> ", line);
+			for (int i=0; err[i] != 0; i++)
+			{
+				char c[2] = {err[i], 0};
+				(*CLI_lineOut)(&c[0]);
+			}
+		}
+		return false;
+	}
+}
+
+// to recive a single caracter
+bool CLI_charIn(char c)
+{
+	bool ok = true;
+	if ((c >= 'a') && (c <= 'z'))
+	{
+		c &= (~0x20); // convert to uppercase
+	}
+
+	if ( //TODO: update list of accepted characters
+			   ((c >= 'A') && (c <= 'Z'))
+			|| ((c >= '0') && (c <= '9'))
+			|| (c == ' ')
+			|| (c == '-')
+			|| (c == '_')
+		)
+	{
+		FIFOBuffChar_put(FIFO, c); // save char in buffer
+		if (CLI_lineOut != NULL)
+		{ // echo to terminal
+			(*CLI_lineOut)(&c);
+		}
+	}
+	else
+	{
+		char str[100];
+		switch (c)
+		{
+			case '\n':
+			case '\r':
+				if (CLI_lineOut != NULL)
+				{ // echo to terminal
+					(*CLI_lineOut)(&c);
+				}
+				FIFOBuffChar_t* fifo = FIFO;
+				FIFO = FIFOBuffChar_create();
+				ok = tryExecute(fifo);
+				FIFOBuffChar_delete(fifo);
+				break;
+			
+			case 127: // backspace
+				if (FIFOBuffChar_pop(FIFO))
+				{
+					(*CLI_lineOut)("\x1b");
+					(*CLI_lineOut)("[");
+					(*CLI_lineOut)("D");
+				}
+				break;
+
+			case 27: // escape (start for arrow keys)
+				sprintf(&str[0], "\ninvlid char: ESC - (%i)\n", c);
+				for (int i=0; str[i] != 0; i++)
+				{
+					char ch[2] = {str[i], 0};
+					(*CLI_lineOut)(&ch[0]);
+				}
+				break;
+
+			default:
+				sprintf(&str[0], "\ninvlid char: '%c' - (%i)\n", c, c);
+				for (int i=0; str[i] != 0; i++)
+				{
+					char ch[2] = {str[i], 0};
+					(*CLI_lineOut)(&ch[0]);
+				}
+				break;
+		}
+	}
+
+	return ok;
+}
diff --git a/CLI/CLI.h b/CLI/CLI.h
index e7d72e6..763dfad 100644
--- a/CLI/CLI.h
+++ b/CLI/CLI.h
@@ -5,10 +5,10 @@
 
 #include "../CMDList/CMDList.h"
 
-typedef CLI_lineOutFn(char* line) CLI_lineoutFn_t;
+typedef int (*CLI_lineOutFn)(const char* line);
 
 // initilize and register the lineout print function
-bool CLI_init(CLI_lineoutFn_t* lineOut, CMDList_t* cmdList);
+bool CLI_init(CLI_lineOutFn lineOut, CMDList_t* cmdList);
 bool CLI_deinit();
 
 // to recive a single caracter
diff --git a/CMDList/printList.c b/CMDList/printList.c
new file mode 100644
index 0000000..a10d073
--- /dev/null
+++ b/CMDList/printList.c
@@ -0,0 +1,75 @@
+#ifndef PRINTCMDLIST_H
+#define PRINTCMDLIST_H
+
+#include "CMDList.h"
+#include "printList.h"
+
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+#include <stdio.h>
+
+void printCMD(CMDList_t* list, char c, char* indent)
+{
+	char* cmd;
+	if (list->cmd == NULL)
+	{
+		cmd = "(no cmd)";
+	}
+	else
+	{
+		cmd = list->cmd->cmd;
+	}
+
+	printf("%s%c -> %s\n", indent, c, cmd);
+
+	char* indent_p = indent;
+	while (*indent_p != 0)
+	{
+		indent_p++;
+	}
+	*indent_p = ' ';
+   *(indent_p+1) = ' ';
+   *(indent_p+2) = 0;
+
+	printCMDList(list, indent);
+
+	*indent_p = 0;
+}
+
+void printCMDList(CMDList_t* list, char* indent)
+{
+	if (indent == NULL)
+	{
+		indent = (char*)malloc(100 * sizeof(char));
+		*indent = 0;
+	}
+	if (list->a != NULL) printCMD((CMDList_t*)list->a, 'a', indent);
+	if (list->b != NULL) printCMD((CMDList_t*)list->b, 'b', indent);
+	if (list->c != NULL) printCMD((CMDList_t*)list->c, 'c', indent);
+	if (list->d != NULL) printCMD((CMDList_t*)list->d, 'd', indent);
+	if (list->e != NULL) printCMD((CMDList_t*)list->e, 'e', indent);
+	if (list->f != NULL) printCMD((CMDList_t*)list->f, 'f', indent);
+	if (list->g != NULL) printCMD((CMDList_t*)list->g, 'g', indent);
+	if (list->h != NULL) printCMD((CMDList_t*)list->h, 'h', indent);
+	if (list->i != NULL) printCMD((CMDList_t*)list->i, 'i', indent);
+	if (list->j != NULL) printCMD((CMDList_t*)list->j, 'j', indent);
+	if (list->k != NULL) printCMD((CMDList_t*)list->k, 'k', indent);
+	if (list->l != NULL) printCMD((CMDList_t*)list->l, 'l', indent);
+	if (list->m != NULL) printCMD((CMDList_t*)list->m, 'm', indent);
+	if (list->n != NULL) printCMD((CMDList_t*)list->n, 'n', indent);
+	if (list->o != NULL) printCMD((CMDList_t*)list->o, 'o', indent);
+	if (list->p != NULL) printCMD((CMDList_t*)list->p, 'p', indent);
+	if (list->q != NULL) printCMD((CMDList_t*)list->q, 'q', indent);
+	if (list->r != NULL) printCMD((CMDList_t*)list->r, 'r', indent);
+	if (list->s != NULL) printCMD((CMDList_t*)list->s, 's', indent);
+	if (list->t != NULL) printCMD((CMDList_t*)list->t, 't', indent);
+	if (list->u != NULL) printCMD((CMDList_t*)list->u, 'u', indent);
+	if (list->v != NULL) printCMD((CMDList_t*)list->v, 'v', indent);
+	if (list->w != NULL) printCMD((CMDList_t*)list->w, 'w', indent);
+	if (list->x != NULL) printCMD((CMDList_t*)list->x, 'x', indent);
+	if (list->y != NULL) printCMD((CMDList_t*)list->y, 'y', indent);
+	if (list->z != NULL) printCMD((CMDList_t*)list->z, 'z', indent);
+}
+
+#endif
diff --git a/CMDList/printList.h b/CMDList/printList.h
new file mode 100644
index 0000000..59856e0
--- /dev/null
+++ b/CMDList/printList.h
@@ -0,0 +1,8 @@
+#ifndef PRINTCMDLIST_H
+#define PRINTCMDLIST_H
+
+#include "CMDList.h"
+
+extern void printCMDList(CMDList_t* list, char* indent);
+
+#endif
diff --git a/FIFOBuff/FIFOBuffChar.c b/FIFOBuff/FIFOBuffChar.c
index 5756401..6f41aef 100644
--- a/FIFOBuff/FIFOBuffChar.c
+++ b/FIFOBuff/FIFOBuffChar.c
@@ -1,9 +1,8 @@
+#include "FIFOBuffChar.h"
+
 #include <stdlib.h>
 #include <stddef.h>
 #include <stdio.h>
-#include "FIFOBuffChar.h"
-
-
 
 bool FIFOBuffChar_put(FIFOBuffChar_t *fifo, char i) // Change the function parameters to match the declaration
 {
@@ -122,6 +121,48 @@ bool FIFOBuffChar_get(FIFOBuffChar_t *fifo, char *p) // Change the function para
     return ok;
 }
 
+bool FIFOBuffChar_pop(FIFOBuffChar_t *fifo)
+{
+    bool ok = true;
+
+    switch (fifo->size){
+        case 0: // buffer is empty
+            ok = false;
+            break;
+
+        case 1: // singel item in buffer
+            // make buffer empty
+            free(fifo->FirstEl_p);
+            fifo->FirstEl_p = NULL;
+            fifo->LastEl_p = NULL;
+            fifo->size = 0;
+            ok = true;
+            break;
+
+        default: // buffer is at least 2 element big
+            // find the second last element
+            FIFOBuffChar_element_t* secondLastEl = fifo->FirstEl_p;
+            while (
+                   secondLastEl->nextElement != fifo->LastEl_p
+                && ((FIFOBuffChar_element_t*)secondLastEl->nextElement)->nextElement != NULL
+            ){
+                secondLastEl = secondLastEl->nextElement;
+            }
+
+            // remove last element
+            free(fifo->LastEl_p);
+
+            // update chain
+            secondLastEl->nextElement = NULL;
+            fifo->LastEl_p = secondLastEl;
+            fifo->size--;
+            ok = true;
+            break;
+    }
+
+    return ok;
+}
+
 bool FIFOBuffChar_is_full(FIFOBuffChar_t *fifo)
 {
     return fifo->full;
diff --git a/FIFOBuff/FIFOBuffChar.h b/FIFOBuff/FIFOBuffChar.h
index b6eb1b3..9671b9d 100644
--- a/FIFOBuff/FIFOBuffChar.h
+++ b/FIFOBuff/FIFOBuffChar.h
@@ -32,7 +32,10 @@ extern bool FIFOBuffChar_put(FIFOBuffChar_t *fifo, char i);
 
 // get value from buffer and writes it to *p if buffer not empty
 // returns true on success or false otherways
-extern bool FIFOBuffChar_get(FIFOBuffChar_t *fifo, char *p);                    //moet dit "char" zijn of "uint8_t"
+extern bool FIFOBuffChar_get(FIFOBuffChar_t *fifo, char *p);
+
+// pop last added value from the buffer
+extern bool FIFOBuffChar_pop(FIFOBuffChar_t *fifo);
 
 // returns false if last put fails to gain memory and no get is called afterwards or true otherwise
 extern bool FIFOBuffChar_is_full(FIFOBuffChar_t *fifo);