compare-dir 0.5.1

A high-performance directory comparison tool and library
Documentation 
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[![CI-badge]][CI]
[![crate-badge]][crate]
[![docs-badge]][docs]

[CI-badge]: https://github.com/kojiishi/compare-dir/actions/workflows/rust-ci.yml/badge.svg
[CI]: https://github.com/kojiishi/compare-dir/actions/workflows/rust-ci.yml
[crate-badge]: https://img.shields.io/crates/v/compare-dir.svg
[crate]: https://crates.io/crates/compare-dir
[docs-badge]: https://docs.rs/compare-dir/badge.svg
[docs]: https://docs.rs/compare-dir/

# compare-dir

Compare two directories and show the differences, or find duplicated files within a single directory.

* For two directories, it compares the file contents if the file sizes are the same. Useful to verify backup copies.
* For a single directory, it cryptographically hashes matching file sizes to discover exact duplicates.

## Installation

```bash
cargo install compare-dir
```

See [Releases] for the change history.

[Releases]: https://github.com/kojiishi/compare-dir/releases

## Usage

Compare two directories:
```bash
compare-dir <dir1> <dir2>
```

Find duplicated files in a single directory:
```bash
compare-dir <dir>
```

Please use the `-h` option to see all options.

## Hash Cache

The file hashes are cached in a file named `.hash_cache`.

If you think file contents may be changed
without their last modified time changed,
please remove the cache file.
The tool will then recompute the hashes.

If one of ancestor directories has the cache file,
the nearest one is used instead.
You can create an empty file
to use as the cache file at the ancestor directory.

For example,
```bash
touch ~/data/.hash_cache
compare-dir ~/data/subdir
```
Then `~/data/.hash_cache` is used as the cache file
instead of `~/data/subdir/.hash_cache`.