/usr/lib/help/sys_unlock is in scheme9 2013.11.26-1.
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 | S9 EXT (sys:unlock string) ==> unspecific
Remove the lock file (string-append STRING ".lock"). If the
file does not exist, do nothing.
(sys:unlock "foo") ==> unspecific
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