V4/man/man2/umount.2

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.th UMOUNT II 8/5/73
.sh NAME
umount \*- dismount file system
.sh SYNOPSIS
(umount = 22.)
.br
.ft B
sys  umount; special
.ft R
.sh DESCRIPTION
.it Umount
announces to the system that special
file
.it special
is no longer to contain
a removable file system.
The file associated with the special
file reverts to its ordinary interpretation
(see
.it mount
).
.s3
.sh "SEE ALSO"
umount(I), mount(II)
.sh DIAGNOSTICS
Error bit
(c-bit) set if
no
file system was mounted on the special file
or if there are still active files on the
mounted file system.