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ZUPDATE(1) User Commands ZUPDATE(1)


zupdate - recompress bzip2, gzip, xz, zstd files to lzip format


zupdate [options] [files]


zupdate recompresses files from bzip2, gzip, xz, and zstd formats to lzip format. Each original is compared with the new file and then deleted. Only regular files with standard file name extensions are recompressed, other files are ignored. Compressed files are decompressed and then recompressed on the fly; no temporary files are created. The lzip format is chosen as destination because it is the most appropriate for long-term data archiving.

If no files are specified, recursive searches examine the current working directory, and nonrecursive searches do nothing.

If the lzip compressed version of a file already exists, the file is skipped unless the option '--force' is given. In this case, if the comparison with the existing lzip version fails, an error is returned and the original file is not deleted. The operation of zupdate is meant to be safe and not cause any data loss. Therefore, existing lzip compressed files are never overwritten nor deleted.

The names of the original files must have one of the following extensions:

'.bz2', '.gz', '.xz', '.zst', or '.Z', which are recompressed to '.lz'.

'.tbz', '.tbz2', '.tgz', '.txz', or '.tzst', which are recompressed to '.tlz'.

Exit status is 0 if all the compressed files were successfully recompressed (if needed), compared, and deleted (if requested). 1 if a non-fatal error occurred (file not found or not regular, or has invalid format, or can't be deleted). 2 if a fatal error occurred (compressor can't be run, or comparison fails).


display this help and exit
output version information and exit
expand combined extensions; tgz -> tar.lz
don't skip a file even if the .lz exists
ignore non-fatal errors
keep (don't delete) input files
pass one option -v to the lzip compressor
process only the formats in <list>
don't read runtime configuration file
suppress all messages
operate recursively on directories
recursively follow symbolic links
be verbose (a 2nd -v gives more)
-0 .. -9
set compression level [default 9]
set compressor and options for bzip2 format
set compressor and options for gzip format
set compressor and options for lzip format
set compressor and options for xz format
set compressor and options for zstd format


Report bugs to
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Copyright © 2022 Antonio Diaz Diaz. License GPLv2+: GNU GPL version 2 or later <>
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.


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

info zutils

should give you access to the complete manual.

April 2022 zutils 1.12-pre2