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+.Dd October 16, 2013
+.Dt DF 1 1
+.Os Linux
+.Sh NAME
+.Nm df
+.Nd show file system usage
+.Sh SYNOPSIS
+.Nm df
+.Op Fl ahis
+.Sh DESCRIPTION
+df displays the amount of disk space available on a file system.
+.Pp
+If no arguments are given, df shows all the file systems using 512-byte
+blocks.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl a
+Show all file systems including dummy ones.
+.It Fl h
+Not implemented.
+.It Fl s
+Not implemented.
+.It Fl i
+Not implemented.
+.El