tar not working as advertised

[Gary S. Moss VLD/VMB <moss>]

In article <9009191022.aa05623 at VGR.BRL.MIL>, HCART at VAX.OXFORD.AC.UK writes:
|>   find / -local ! -type d -mtime -7 -type f -print | tar ca-
|> 
|> as shown in TFM, nothing is written to tape.
No, the tar command doesn't take the '-' (meaning read STDIN) as a key
letter, but as an argument to the 'f' key, try "tar caf -".  Note, the
space after the 'f', I believe it is mandatory.

RTFM carefully,
-Gary