lziprecover - Man Page

recovers data from damaged lzip files


lziprecover [options] [files]


Lziprecover is a data recovery tool and decompressor for files in the lzip compressed data format (.lz). Lziprecover is able to repair slightly damaged files (up to one single-byte error per member), produce a correct file by merging the good parts of two or more damaged copies, reproduce a missing (zeroed) sector using a reference file, extract data from damaged files, decompress files, and test integrity of files.

With the help of lziprecover, losing an entire archive just because of a corrupt byte near the beginning is a thing of the past.

Lziprecover can remove the damaged members from multimember files, for example multimember tar.lz archives.

Lziprecover provides random access to the data in multimember files; it only decompresses the members containing the desired data.

Lziprecover facilitates the management of metadata stored as trailing data in lzip files.

Lziprecover is not a replacement for regular backups, but a last line of defense for the case where the backups are also damaged.


-h,  --help

display this help and exit

-V,  --version

output version information and exit

-a,  --trailing-error

exit with error status if trailing data

-A,  --alone-to-lz

convert lzma-alone files to lzip format

-c,  --stdout

write to standard output, keep input files

-d,  --decompress


-D,  --range-decompress=<n-m>

decompress a range of bytes to stdout

-e,  --reproduce

try to reproduce a zeroed sector in file


reproduce one level, all, or match length


name of lzip executable for --reproduce


reference file for --reproduce

-f,  --force

overwrite existing output files

-i,  --ignore-errors

ignore some errors in -d, -D, -l, -t, --dump

-k,  --keep

keep (don't delete) input files

-l,  --list

print (un)compressed file sizes

-m,  --merge

correct errors in file using several copies

-o,  --output=<file>

place the output into <file>

-q,  --quiet

suppress all messages

-R,  --repair

try to repair a small error in file

-s,  --split

split multimember file in single-member files

-t,  --test

test compressed file integrity

-v,  --verbose

be verbose (a 2nd -v gives more)


allow trailing data seeming corrupt header


dump members listed/damaged, tdata to stdout


remove members, tdata from files in place


copy files to stdout stripping members given

If no file names are given, or if a file is '-', lziprecover 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 'lziprecover -cd foo.tar.lz | tar -xf -'.

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

Reporting Bugs

Report bugs to lzip-bug@nongnu.org
Lziprecover home page: http://www.nongnu.org/lzip/lziprecover.html

See Also

The full documentation for lziprecover is maintained as a Texinfo manual.  If the info and lziprecover programs are properly installed at your site, the command

info lziprecover

should give you access to the complete manual.


January 2022 lziprecover 1.23