autounmountd —
daemon unmounting automounted file systems
  
    | autounmountd | [ -rtime]
      [-ttime]
      [-dv] | 
The autounmountd daemon is responsible for unmounting
  file systems mounted by
  automountd(8). On startup,
  autounmountd retrieves a list of file systems that
  have the automounted mount option set. The list is
  updated every time a file system is mounted or unmounted. After a specified
  time passes, autounmountd attempts to unmount a file
  system, retrying after some time if necessary.
These options are available:
  - -d
- Debug mode: increase verbosity and do not daemonize.
- -r
- Number of seconds to wait before trying to unmount an expired file system
      after a previous attempt failed, possibly due to file system being busy.
      The default value is 600, or ten minutes.
- -t
- Number of seconds to wait before trying to unmount a file system. The
      default value is 600, or ten minutes.
- -v
- Increase verbosity.
Theautounmountd utility exits 0 on success,
  and >0 if an error occurs.
The autounmountd daemon appeared in
  FreeBSD 10.1. The autounmountd
  daemon appeared in DragonFly 4.5. The
  autounmountd command appeared in
  NetBSD 9.0.
The autounmountd was developed by
  Edward Tomasz Napierala
  <trasz@FreeBSD.org>
  under sponsorship from the FreeBSD Foundation.
autounmountd was ported to
    DragonFly and NetBSD by
    Tomohiro Kusumi
    <kusumi.tomohiro@gmail.com>.