read number from stdin and write to stdout

in_out.asm

@@ -1,10 +1,25 @@
+section .bss
+	num resb 5	;"variable" for numbers
+
 section .text
 	global _start
 
 _start:
-	mov edx,1	;expect message 1 byte
-	mov ecx,ecx	;set register?
-	mov ebx,1	;std in?
+	;Read input 5 byte numeric
+	mov edx,5	;expect message 1 byte
+	mov ecx,num	;set register?
+	mov ebx,2	;std in?
 	mov eax,3	;set call sys_read
 	int 0x80	;kernel exec
 
+	;Write input back to console
+	mov edx,5	;expect message 1 byte
+	mov ecx,num	;set register?
+	mov ebx,1	;std in?
+	mov eax,4	;set call sys_read
+	int 0x80	;kernel exec
+
+	;exit programm
+	mov eax,1
+	mov ebx,0
+	int 0x80