Further investigation reveals that my 'real use' of 7z with -si and -so
simultaneously breaks because 7z does support this behaviour for some
compression methods (e.g. gzip) and doesn't for others (e.g. default
methods which I want to use).
My sample up there has a typo:
$ echo foo | 7z -a dummy -tgzip -si -so > testfile
^
The '-' should not be there and thus breaks the correct sample command line
from documentation. When used properly this works.
What still does not work is:
$ echo foo | 7z a dummy -si -so > testfile
So the resolution should be changed to indicate that the simultaneous
use of -si and -so is dependent on a restricted selection of compression
methods.
--
reading from stdin and at the same time writing to stdout does not work
https://bugs.launchpad.net/bugs/668727
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