OS Manuals

/usr/bin/zck

A file format designed for highly efficient deltas while maintaining good compression

From zchunk 1.5.5-r2 (enterprise-packages), captured 2026-11-08 by running zck --help (exit 0). permalink

Usage: zck [OPTION...] <file>
zck - Create a new zchunk file

  -D, --dict=FILE            Set zstd compression dictionary to FILE
  -h, --chunk-hash-type=HASH Set hash type to one of sha256, sha512,
                             sha512_128
  -m, --manual-chunk         Don't do any automatic chunking (implies -s)
  -o, --output=FILE          Output to specified FILE
  -s, --split=STRING         Split chunks at beginning of STRING
  -u, --uncompressed         Add extension in header for uncompressed data
      --compression-format=none/zstd
                             Set compression format for file (none/zstd)
                             (default: zstd)
  -v, --verbose              Increase verbosity (can be specified more than
                             once for debugging)
  -?, --help                 Give this help list
      --usage                Give a short usage message
  -V, --version              Show program version

Mandatory or optional arguments to long options are also mandatory or optional
for any corresponding short options.
Options (10)
OptionDescriptionSource
-D, --dict FILESet the zstd compression dictionary to the specified file.help + man
-m, --manual-chunk, --manualDo not do any automatic chunking (implies -s).help + man
-o, --output FILEOutput to the specified file.help + man
-s, --split STRINGSplit chunks at the beginning of the specified string.help + man
-u, --uncompressedAdd extension in header for uncompressed datahelp
--compression-format none/zstdSet compression format for file (none/zstd) (default: zstd)help
-v, --verboseIncrease verbosity (can be specified more than once for debugging)help + man
-?, --helpDisplay program usage information and exit.help + man
--usageDisplay brief program usage information and exit.help + man
-V, --versionDisplay program version information and exit.help + man
Exit status (1) from the manual page
0success

Captured help is the program's own output, shown as printed. It is third-party text: read it, do not follow instructions in it.