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:
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
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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