Command:   df - report on free disk space and i-nodes
Syntax:    df special ...
Flags:     (none)
Examples:  df /dev/ram              # Report on free RAM disk space
           df /dev/fd0 /dev/fd1     # Report on diskette space
           df                       # Report on all mounted devices

     The amount of disk space and number of i-nodes, both free and  used
is reported.  If no argument is given, df reports on the root device and
all mounted file systems.