sed reads the specified files or the standard input if no
files are specified, makes editing changes according to a
list of commands, and writes the results to the standard
output.

This is the source diff package

PERMISSION  UID  GID    PACKED    SIZE  RATIO METHOD CRC     STAMP     NAME
---------- ----------- ------- ------- ------ ---------- ------------ ----------
-rw-r--r--  1000/1000      822    2296  35.8% -lh5- 36bd Nov 19  2005 sed-4.1.4-ppc-amigaos-diff
---------- ----------- ------- ------- ------ ---------- ------------ ----------
 Total         1 file      822    2296  35.8%            Nov 19  2005