Re: [gentoo-user] lzma archives

[Jorge Peixoto de Morais Neto]

On Thu, Nov 6, 2008 at 8:39 AM, Florian Philipp
<lists@f_philipp.fastmail.net> wrote:
> Jorge Peixoto de Morais Neto schrieb:
>> On Wed, Nov 5, 2008 at 2:38 PM, Nickolay Hodyunya <nickolayh@×××××.com> wrote:
>>> How to extract lzma archives?
>>
>> by lzma archive, you probably mean a lzma-compressed tar archive.
>> You can extract them with
>> lzma -dc compressedarchive.tar.lzma | tar -xv -f -
>
> This command line can be simplified:
> unlzma -c compressedarchive.tar.lzma | tar xv

I like to do things right (I love Math, exactness and rigor). From
tar's info page

   If you don't specify this argument [the argument to -f] , then
`tar' will examine the
environment variable `TAPE'.  If it is set, its value will be used as
the archive name.  Otherwise, `tar' will use the default archive,
determined at the compile time. [...]  If there is no tape drive
attached, or the default is not meaningful, then `tar' will print an
error message.  The error message might look
roughly like one of the following:

     tar: can't open /dev/rmt8 : No such device or address
     tar: can't open /dev/rsmt0 : I/O error

To avoid confusion, we recommend that you always specify an archive file
name by using `--file=ARCHIVE-NAME' (`-f ARCHIVE-NAME') when writing
your `tar' commands.

Regarding old-style tar options (that is, tar options without a dash):

old style syntax makes it difficult to match
option letters with their corresponding arguments, and is often
confusing
[...]

   This old way of writing `tar' options can surprise even experienced
users.  For example, the two commands:

     tar cfz archive.tar.gz file
     tar -cfz archive.tar.gz file

are quite different.


So I use either tar --lzma -xv -f  compressedarchive.tar.lzma or, when
using an old tar,
lzma -dc compressedarchive.tar.lzma | tar -xv -f -