/usr/lib/s9fes/help/sys_usleep is in scheme9 2010.11.13-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | S9 EXT (sys:sleep integer) ==> unspecific
(sys:usleep integer) ==> unspecific
Suspend process execution for the given number of seconds (SYS:SLEEP)
or microseconds (SYS:USLEEP).
(sys:sleep 3) ==> unspecific
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