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df(1) - Unix First Edition Manual Page
11/3/71DF (I)

NAME df -- disk free
SYNOPSIS df [ filesystem ]
DESCRIPTION prints out the number of free blocks available on a filesystem. If the file system is unspecified, the free space

on /dev/rf0 and /dev/rk0 is printed.
FILES /dev/rf0, /dev/rk0

SEE_ALSO check
OWNER ken, dmr