Change in man page to document "-" flag as stdin/stdout, add

example showing how to move file hierarchies.
Reviewed by:	jkh

gnu/usr.bin/tar/tar.1

@@ -3,7 +3,7 @@
 .\"
 .\"	Written by John F. Woods <jfw@jfwhome.funhouse.com>
 .\"
-.\"	$Id: tar.1,v 1.4 1995/10/25 02:17:44 torstenb Exp $
+.\"	$Id: tar.1,v 1.5 1996/02/09 21:14:26 jmz Exp $
 .\"
 .Dd 6 August 1994
 .Os FreeBSD
@@ -152,7 +152,8 @@ will use
 .Xr rmt 8
 to read or write the specified
 .Ar file
-on a remote machine.
+on a remote machine. "-" may be used is a filename, for reading
+or writing to/from stdin/stdout.
 .It Fl F Ar file
 .It Fl -info-script Ar file
 .It Fl -new-volume-script Ar file
@@ -168,7 +169,7 @@ Create/list/extract old GNU-format incremental backup.
 .It Fl -listed-incremental Ar file
 Create/list/extract new GNU-format incremental backup.
 .It Fl h
-.it Fl -dereference
+.It Fl -dereference
 Don't write symlinks as symlinks; write the data of the files they name.
 .It Fl i
 .It Fl -ignore-zeros
@@ -318,6 +319,11 @@ attempting to expand it according the files in the current working
 directory (the shell does not have access to the list of files in
 the archive, of course).
 .Pp
+To move file hierarchies, use a command line like this:
+.Bd -literal
+tar tar -cf - -C srcdir . | tar xpf - -C destdir
+.Ed
+.Pp
 To create a compressed archive on diskette, using gzip, use a command-line like
 .Dl tar --block-compress -z -c -v -f /dev/rfd1a -b 36 tar/
 Note that you cannot mix bundled flags and --style flags; you can use