On Wed, 27 Aug 2014, Warren Block wrote:

On Tue, 26 Aug 2014, Daniel Eischen wrote:

The man page is a little confusing.  Here it says:

 --options options
     Select optional behaviors for particular modules.  The
     argument is a text string containing comma-separated
     keywords and values. These are passed to the modules that
     handle particular formats to control how those formats will
     behave.  Each option has one of the following forms:

             The key will be set to the specified value in every
             module that supports it.  Modules that do not
             support this key will ignore it.

Then below, after the last option, it says:

             Use type as compression method.  Supported values are
             store (uncompressed) and deflate (gzip algorithm).

     If a provided option is not supported by any module, that is a
     fatal error.

The first states that it is ignored, the latter states that it
is a fatal error.  The meaning of "any module" is subtle, at
least for my feeble brain ;-)

It suggests that options are passed to all modules, and each module is free to ignore options it does not understand. But at least one module must understand the option, or a fatal error is reported.

Yes, I got that, but it is confusing when you are intentionally
passing to only one module, as in the original post, "xz:9",
and considering that the "fatal error" and "ignore it" parts
are listed in separate sections.  Regardless, tar(1) has many
options, so a little confusion is not unsurprising :-)

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