---
name: "lzip.xlunzip"
section: "1"
platform: "linux"
package: "xlunzip"
version: "0.9-3"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/lzip.xlunzip"
---

# lzip.xlunzip(1)

test tool for the lzip\_decompress linux module

## NAME

xlunzip - test tool for the lzip\_decompress linux module

## SYNOPSIS

**xlunzip** \[*options*\] \[*files*\]

## DESCRIPTION

Xlunzip is a test tool for the lzip decompression code of my lzip patch for linux. Xlunzip is similar to lunzip, but it uses the lzip\_decompress linux module as a backend. Xlunzip tests the module for stream, buffer-to-buffer, and mixed decompression modes, including in-place decompression (using the same buffer for input and output). You can use xlunzip to check that the module produces correct results when decompressing single member files, multimember files, or the concatenation of two or more compressed files. Xlunzip can be used with unzcrash to test the robustness of the module to the decompression of corrupted data.

The distributed index feature of the lzip format allows xlunzip to decompress concatenated files in place. This can't be guaranteed to work with formats like gzip or bzip2 because they can't detect whether a high compression ratio in the first members of the multimember data is being masked by a low compression ratio in the last members.

## OPTIONS

- **-h**, **--help**

  display this help and exit

- **-V**, **--version**

  output version information and exit

- **-c**, **--stdout**

  write to standard output, keep input files

- **-d**, **--decompress**

  decompress (this is the default)

- **-f**, **--force**

  overwrite existing output files

- **-I**, **--in-place**

  decompress or test using only one buffer

- **-k**, **--keep**

  keep (don't delete) input files

- **-o**, **--output=**\<file\>

  write to \<file\>, keep input files

- **-q**, **--quiet**

  suppress all messages

- **-t**, **--test**

  test compressed file integrity

- **-v**, **--verbose**

  be verbose (a 2nd **-v** gives more)

### These options are ignored when --in-place is in effect:

- **--insize\[=**\<size\>\]

  pre-allocate and fill inbuf \[default 16 KiB\]

- **--outsize\[=**\<size\>\]

  pre-allocate outbuf \[default 512 MiB\]

- **--nofill**

  do not pass a fill function; requires **--insize**

- **--noflush**

  do not pass a flush function; requires **--outsize**

If no file names are given, or if a file is '-', xlunzip decompresses from standard input to standard output. Numbers may be followed by a multiplier: k = kB = 10^3 = 1000, Ki = KiB = 2^10 = 1024, M = 10^6, Mi = 2^20, G = 10^9, Gi = 2^30, etc...

To extract all the files from archive 'foo.tar.lz', use the commands 'tar **-xf** foo.tar.lz' or 'xlunzip **-cd** foo.tar.lz \| tar **-xf** -'.

Exit status: 0 for a normal exit, 1 for environmental problems (file not found, invalid command-line options, I/O errors, etc), 2 to indicate a corrupt or invalid input file, 3 for an internal consistency error (e.g., bug) which caused xlunzip to panic.

## REPORTING BUGS

Report bugs to lzip-bug@nongnu.org\
 Xlunzip home page: http://www.nongnu.org/lzip/xlunzip.html

## COPYRIGHT

Copyright © 2025 Antonio Diaz Diaz. License GPLv2+: GNU GPL version 2 or later \<http://gnu.org/licenses/gpl.html\>\
 This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.