shell: avoid printing stdio input

source/shell/cmd.c

@@ -22,8 +22,6 @@ static char *prompt(const char *prefix)
 		return NULL;
 
 	while ((c = getchar()) && c != '\n') {
-		putchar(c);
-
 		if (nbytes + 1 >= nalloc_bytes) {
 			nalloc_bytes *= 2;
 
@@ -36,7 +34,6 @@ static char *prompt(const char *prefix)
 		line[nbytes++] = c;
 	}
 
-	printf("\n");
 	line[nbytes] = '\0';
 
 	return line;