pack (Unix)
From Just Solve the File Format Problem
pack is a command in Unix-style operating systems to compress files using Huffman coding. Files normally have a lowercase .z extension, appended to their names including any other extension they may already have in their uncompressed versions, e.g., file.txt.z.
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See also
Identification
Files begin with bytes 0x1F 0x1E.
The gzip source code mentions an "old pack format" that begins with 0x1F 0x1F.
See also compress (Unix)#The 0x1f compression family.
Software
- GNU gzip (decompression only) [Note: Broken in v1.6 - 1.8]
- Tenth Edition of Unix → v10src.tar.bz2 → cmd/pack/ - Source code
- illumos: pack, unpack - Source code
- https://github.com/koalaman/pack - A modern implementation in Haskell
