POSIX-conformance fixes for "-" used as an operand.

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+2004-08-10  Paul Eggert  <eggert@cs.ucla.edu>
+
+       POSIX-conformance fixes for "-" used as an operand.
+       * coreutils.texi (Common options): Clarify that "-" means
+       stdin/stdout only when it is an operand, not when it is an
+       option-argument.
+       (shred invocation): "shred -- -" is equivalent to "shred -",
+       not to "shred ./-".
+       (tee invocation): "tee -" means to copy (again) to stdout.
+
 2004-07-25  Paul Eggert  <eggert@cs.ucla.edu>
 
        * coreutils.texi (nice invocation): Document the "nice value", and