umount.8

UNIX v6源代码 这几乎是最经典的unix版本 unix操作系统设计和莱昂氏unix源代码分析都是用的该版

.th UMOUNT VIII 10/31/73
.sh NAME
umount \*- dismount file system
.sh SYNOPSIS
.bd /etc/umount
special
.sh DESCRIPTION
.it Umount
announces to the system that the removable file system previously
mounted on special file
.it special
is to be removed.
.sh "SEE ALSO"
mount (VIII), umount (II), mtab (V)
.sh FILES
/etc/mtab	mounted device table
.sh DIAGNOSTICS
It complains if
the special file is not mounted or if it is busy.
The file system is busy if
there is an open file on it or if
someone has his current directory there.
.sh BUGS