UNZCK(1) General Commands Manual UNZCK(1)

# [NAME](#NAME)

`unzck` — decompress a file in the zchunk format

# [SYNOPSIS](#SYNOPSIS)

`unzck` \[`-c` | `--stdout`] \[`--dict`] \[`-v` | `--verbose`] `file`

`unzck` `-`? | `--help`

`unzck` `--usage`

`unzck` `--version`

# [DESCRIPTION](#DESCRIPTION)

The `unzck` utility extracts the original file from a zchunk-compressed one.

[*NOTE:*](#NOTE:) The `unzck` utility will place the new file without the .zck extension in the [*current*](#current) working directory, not in the directory where the original file resides.

The `unzck` utility accepts the following optional arguments:

[`-c`](#c), `--stdout`

Extract the data to the standard output stream, do not write it to a file.

[`--dict`](#dict)

Only extract the zstd compression dictionary.

[`-v`](#v), `--verbose`

Verbose operation; display some diagnostic output.

`-`?, `--help`

Display program usage information and exit.

[`--usage`](#usage)

Display brief program usage information and exit.

[`--version`](#version)

Display program version information and exit.

# [EXIT STATUS](#EXIT_STATUS)

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

# [EXAMPLES](#EXAMPLES)

Create (in the current directory) an uncompressed words file from a compressed one:

`unzck /mnt/xfer/words.zck`

Do not create the words file, but send the contents to the standard output stream:

`unzck -c /mnt/xfer/words.zck`

# [SEE ALSO](#SEE_ALSO)

[zck(1)](/man/enterprise-packages/zchunk/zck.1), [zck\_delta\_size(1)](/man/enterprise-packages/zchunk/zck_delta_size.1), [zck\_gen\_zdict(1)](/man/enterprise-packages/zchunk/zck_gen_zdict.1), [zck\_read\_header(1)](/man/enterprise-packages/zchunk/zck_read_header.1), [zckdl(1)](/man/enterprise-packages/zchunk/zckdl.1)

# [AUTHOR](#AUTHOR)

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

May 31, 2020 Linux 4.19.0-gvisor

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Document: unzck(1) from zchunk 1.5.4-r4 (Chainguard OS)
Source: https://github.com/zchunk/zchunk.git