The brainfuck interpreter knows the following instructions:

Cmd  Effect                               
---  ------                               
+    Increases element under pointer      
-    Decrases element under pointer       
>    Increases pointer                    
<    Decreases pointer                    
[    Starts loop, flag under pointer      
]    Indicates end of loop                
.    Outputs ASCII code under pointer     
,    Reads char and stores ASCII under ptr

Who can program anything useful with it? :)

PERMISSION  UID  GID    PACKED    SIZE  RATIO METHOD CRC     STAMP     NAME
---------- ----------- ------- ------- ------ ---------- ------------ ----------
[generic]                 1200    4281  28.0% -lh5- 610c Nov 29 22:13 brainfuck.rexx
---------- ----------- ------- ------- ------ ---------- ------------ ----------
 Total         1 file     1200    4281  28.0%            Nov 30 01:30