Add Sun alike fbtab functionality.

Reviewed by:
Submitted by:	guido

share/man/man5/fbtab.5

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+.\" this is comment
+.Dd August 22, 1994
+.Dt FBTAB 5
+.Os FreeBSD 2.0
+.Sh NAME
+.Nm fbtab
+.Nd change device protection upon login
+.Sh DESCRIPTION
+The
+.Nm fbtab
+file contains a number of lines specifying a device together with a list
+of devices with associated protections. 
+for which the use of S/Key passwords is obligated.
+Comments start with a # and extend to the end of the line.
+.Pp
+Blank lines or lines with only a comment are ignored.
+.Pp
+All other lines consist of three fields delimited by
+whitespace: a login device (/dev/ttyv0), an octal
+permission number (0600), and a ":"-delimited list of
+devices (/dev/console). All device names are
+absolute paths. A path that ends in "/*" refers to all
+directory entries except "." and "..".
+.Pp
+If the tty argument (relative path) matches a login device
+name (absolute path), the permissions of the devices in the
+":"-delimited list are set as specified in the second
+field, and their ownership is changed to that of the uid
+and gid arguments.
+.Sh FILES
+.Bl -tag -width /etc/fbtab -compact
+.It Pa /etc/fbtab
+The
+.Nm fbtab
+file resides in
+.Pa /etc .
+.El
+.Sh SEE ALSO
+.Xr login 1 ,
+.Xr getty 8
+.Sh AUTHOR
+Guido van Rooij