V3/usr/man/man2/umount.2

Find at most related files.
including files from this version of Unix. 
.pa 1
.he 'UMOUNT (II)'3/15/72'UMOUNT (II)'
.ti 0
NAME		umount  -- dismount file system
.sp
.ti 0
.nf
SYNOPSIS	sys umount; special  / umount = 22.
.fi
.sp
.ti 0
DESCRIPTION	umount______
announces to the system that special
file special_______ is no longer to contain
a removable file system.
The file associated with the special
file reverts to its ordinary interpretation (see mount_____).

The user must take
care that all activity on the file system has ceased.
.sp
.ti 0
SEE ALSO	umount(I), mount(II)
.sp
.ti 0
DIAGNOSTICS	Error bit
(c-bit) set if
no
file system was mounted on the special file.
.sp
.ti 0
BUGS		Use
of this call should
be restricted to the super-user.