Here are the different file signatures:

foo@host> cat l6 | l6 - -sha1
Using digest version SHA-1, library version 1.2
-STANDARD INPUT-//X - - - [-,-] 6048 bytes 4516d5c3bd3699ec63ddfd3b175574e738cbf013

foo@host> cat l6 | l6 -
-STANDARD INPUT-//X - - - [-,-] 6048 bytes 69867e4c837dfada6b372f97a5cf58b4

A copy of these signatures can be found at http://www.pgci.ca/l6.html
gilbert@pgci.ca