SF: play.c
SN: list of commands
---
-N: jmp
-D: Jump to position in current file.
-U: jmp <percent>
-H: The <percent> argument should be an integer between 0 and 100.
----
-N: ff
-D: Jump forwards or backwards.
-U: ff <seconds>
-H: Negative values mean to jmp backwards the given amount of seconds.
----
N: ls
D: List playlist.
U: ls