Compress (Unix)

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* [http://web.archive.org/web/20130702195528/http://www.willus.com/archive/unixcmds.zip Windows port of Compress utility]
 
* [http://web.archive.org/web/20130702195528/http://www.willus.com/archive/unixcmds.zip Windows port of Compress utility]
 
* {{Deark}}
 
* {{Deark}}
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* [https://github.com/temisu/ancient Ancient]
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== Sample files ==
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* {{DexvertSamples|archive/compress}}
  
 
== External links ==
 
== External links ==
* [[Wikipedia:Compress|Wikipedia article]]
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* [[Wikipedia:Compress (software)|Wikipedia article]]
  
 
[[Category:File formats with extension .z]]
 
[[Category:File formats with extension .z]]
 
[[Category:File formats with case sensitive extensions]]
 
[[Category:File formats with case sensitive extensions]]
 
{{DISPLAYTITLE:compress (Unix)}}
 
{{DISPLAYTITLE:compress (Unix)}}

Latest revision as of 05:14, 28 December 2023

File Format
Name compress (Unix)
Ontology
Extension(s) .Z
MIME Type(s) application/x-compress
Wikidata ID Q29209269
Released ~1984
This article is about a specific file format. For compression in general, see Compression.

compress is a Unix command line utility, and a general-purpose compressed file format. Its compression algorithm is based on LZW.

Contents

[edit] Identifiers

The conventional filename extension is a capitalized .Z.

[edit] Identification

Files begin with bytes 1f 9d.

[edit] See also

Formats that could be considered to be the successors of compress include Freeze/Melt, and (especially) Gzip.

[edit] The 0x1f compression family

There are several compressed file formats, with similar features, that begin with byte value 0x1f (octal 037; decimal 31). We arbitrarily choose compress as the representative example, and list the formats here.

Signature (hex) Format
1f 1e pack (Unix)
1f 1f pack (Unix) - old format
1f 8b gzip
1f 9d compress
1f 9e Freeze/Melt - old format
1f 9f Freeze/Melt - new format
1f a0 SCO compress LZH
1f a1 Quasijarus Strong Compression
1f ff or ff 1f compact (Unix)

[edit] Software

[edit] Sample files

[edit] External links

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