Parchive

https://parchive.github.io/
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Parchive is a redundant file format that enables recovery of damaged files using distributed...
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### License Notice Example

Source: https://parchive.github.io/doc/Parity%20Volume%20Set%20Specification%20v2.0.html

An example of how to include the GNU Free Documentation License notice in your own documents.

```text
Copyright (c) YEAR YOUR NAME. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".
```

--------------------------------

### Example 1: Basic File

Source: https://parchive.github.io/doc/Parity_Volume_Set_Specification_v3.0.html

Chunk description for a 10,000-byte file following the pattern 'abcdefghij'. Fingerprint and rolling hashes are omitted for clarity.

```text
{length=10000, firstblockindex=0}
```

--------------------------------

### Repair files using par2cmdline (from source)

Source: https://parchive.github.io/

Example command to repair files using the par2cmdline utility after installing from source.

```bash
par2 repair *.par2
```

--------------------------------

### Repair files using par2cmdline (Ubuntu/Debian)

Source: https://parchive.github.io/

Example command to repair files using the par2cmdline utility installed via apt.

```bash
sudo apt install par2
par2 repair *.par2
```

--------------------------------

### Get par2cmdline help

Source: https://parchive.github.io/

Commands to get help documentation for the par2cmdline client.

```bash
par2 --help
man par2
par2cmdline --help
man par2cmdline
```

--------------------------------

### Example 2: File with a Tail

Source: https://parchive.github.io/doc/Parity_Volume_Set_Specification_v3.0.html

Chunk description for an 11,000-byte file following the pattern 'abcdefghijk'.

```text
{length=11000, firstblockindex=0, tailblockindex=5, tailoffset=0}
```

--------------------------------

### Example 4: Tail Packing and Small File

Source: https://parchive.github.io/doc/Parity_Volume_Set_Specification_v3.0.html

Chunk descriptions for a 3,000-byte file ('abc') and a 1,000-byte file ('z') demonstrating tail packing.

```text
{length=3000, firstblockindex=0, tailblockindex=1, tailoffset=0}
```

```text
{length=1000, tailblockindex=1, tailoffset=1000}
```

--------------------------------

### Repair files using par2cmdline (Arch/Antergos)

Source: https://parchive.github.io/

Example command to repair files using the par2cmdline utility installed via pacman.

```bash
sudo pacman -S par2cmdline
par2 repair *.par2
```

--------------------------------

### Example 5: Tiny File with Tail Data

Source: https://parchive.github.io/doc/Parity_Volume_Set_Specification_v3.0.html

Chunk descriptions for a 3,000-byte file ('abc') and a 10-byte file ('qrstuvwxyz') with inline tail data.

```text
{length=3000, firstblockindex=0, tailblockindex=1, tailoffset=0}
```

```text
{length=10, taildata="qrstuvwxyz"}
```

--------------------------------

### Window After New Block Initialization

Source: https://parchive.github.io/doc/Parity_Volume_Set_Specification_v3.0.html

The window state after no matches are found and a new preliminary chunk is started with a new input block.

```text
W=[00011122233]

```

--------------------------------

### Example 3: File Using Multiple Chunks

Source: https://parchive.github.io/doc/Parity_Volume_Set_Specification_v3.0.html

Chunk descriptions for a new 15,000-byte file ('abcde0123fghijk') derived from an old version, showing data reuse and insertion.

```text
{length=5000, firstblockindex=0, tailblockindex=2, tailoffset=0}
{length=5000, firstblockindex=6, tailblockindex=2, tailoffset=1000}
{length=5000, firstblockindex=3, tailblockindex=5, tailoffset=0}
```
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