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# 7-zip
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[7-zip](https://7-zip.org/) is a free and open-source file archiver.
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It places files or directories in an archive and is able to compress them.
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## Setup
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7-zip can be installed by installing the packages `p7zip-full` and `p7zip-rar` on Ubuntu systems.
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On [Arch Linux](/wiki/linux/arch-linux.md) it can be installed with the package `7-zip`
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from the [AUR](/wiki/linux/package_manager.md#arch-linux-pacman-and-yay).
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## Usage
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### Compressing and Uncompressing a Directory
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For directories to be compressed the Lempel–Ziv–Markov chain algorithm is recommended.
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It is fast with good compression results.
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As explained by
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[kenorb on superuser.com](https://superuser.com/questions/281573/what-are-the-best-options-to-use-when-compressing-files-using-7-zip)
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An effective way to compress a directory is the following command where `directory` is the directory
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that is to be compressed.
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The archive will be created by the same name as the directory but with the `.7z` extension.
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This command uses [expansion](/wiki/linux/shell.md#expansion).
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The directory is not deleted automatically afterwards.
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```sh
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7z a -t7z -m0=lzma -mx=9 -mfb=64 -md=32m -ms=on directory{.7z,}
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```
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To uncompress it run the following command.
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```sh
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7z x directory.7z
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```
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### Peek Contents of an Archive
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To list the content files of a 7-zip archive the following command can be used.
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The name of the archive is assumed to be `directory.7z`.
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```sh
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7z l directory.7z
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```
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