zck - Man Page

compress a file using the zchunk format


zck[-D file | --dict=file] [-m chunk | --manual=chunk] [-o file | --output=file] [-s string | --split=string] [-v | --verbose file
zck-? | --help | --usage | --version


The zck utility creates a new zchunk file from the data in the specified input file.

NOTE: If no output file is specified using the -o option, the zck utility will place the new file with the .zck extension in the current working directory, not in the directory where the original file resides.

The zck utility accepts the following optional arguments:

-D, --dict

Set the zstd compression dictionary to the specified file.

-m, --manual

Do not do any automatic chunking (implies -s).

-o, --output

Output to the specified file.

-s, --split

Split chunks at the beginning of the specified string.

-v, --verbose

Verbose operation; display some diagnostic output.

-?, --help

Display program usage information and exit.


Display brief program usage information and exit.


Display program version information and exit.

Exit Status

The zck utility exits 0 on success, and >0 if an error occurs.


Create (in the current directory) a zchunk-compressed words.zck file from a dictionary:

zck /usr/share/dict/words

The same, but specify an output file:

zck -o /tmp/words.txt.zck /usr/share/dict/words

Generate a zchunk file with chunks separated on HTML sections:

zck -s '<h2>' doc.html

See Also

unzck(1), zck_delta_size(1), zck_gen_zdict(1), zck_read_header(1), zckdl(1)


The zck utility was written by Jonathan Dieter ⟨jdieter@gmail.com⟩. This manual page stub was written by Peter Pentchev ⟨roam@ringlet.net⟩.

Referenced By

unzck(1), zck_delta_size(1), zckdl(1), zck_gen_zdict(1), zck_read_header(1).

May 31, 2020