df.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 DF VIII 1/20/73
.sh NAME
df \*- disk free
.sh SYNOPSIS
.bd df
[ filesystem ]
.sh DESCRIPTION
.it Df
prints out the number of free blocks
available on a file system.
If the file system is unspecified,
the free space on all of
the normally mounted file systems
is printed.
.sh FILES
/dev/rf?,
/dev/rk?,
/dev/rp?
.sh "SEE ALSO"
icheck (VIII)
.sh BUGS