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Re: Suggested file extension for tar lzip

From: Antonio Diaz Diaz
Subject: Re: Suggested file extension for tar lzip
Date: Sun, 19 Jan 2020 18:45:25 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i586; en-US; rv: Gecko/20110420 SeaMonkey/2.0.14

Hi Joel,

Joel May wrote:
I'm working on adding lzip support to Duplicati in the form of .tar.lz
files.  I need to shorten the file extension down to a single segment.
Is there an official recommendation for what that file extension should
be?  Following convention set by other formats (e.g. tgz, txz), it would
be tlz.  Some places on the internet (i.e. Wikipedia) list tlz as "plain"
tar LZMA, so that could cause confusion.

Thanks for adding lzip support to Duplicati. :-)

The official recommendation for a single file extension equivalent to "tar.lz" is "tlz". As you can see in the manual[1], "lzip -d file.tlz" produces a decompressed file named "file.tar".

[1] http://www.nongnu.org/lzip/manual/lzip_manual.html#Introduction

I guess the list of archive formats in the Wikipedia needs an update. Ten years ago, it seems that some people recommended "tlz" as equivalent to "tar.lzma", but I think the lzma-alone format has been mostly abandoned since then because of its defects. See for example the ChangeLog of Slackware:

  Change .tlz to mean .tar.lz. We never really used the previous definition
  (which was tar.lzma), and .lz is a probably a better format than xz or lzma.

or the description of any archive manager:

File-roller supports the following formats:
[...] lzip (.tar.lz, .tlz), [...]

Best regards,

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