The Directory Differential hTool

DDH traverses input directories and their subdirectories. It also hashes files as needed and reports findings.

The H in "hTool" is silent. The H in its abbreviation, "DDH," is not.

This tool is called DDH for two very good reasons.

• DDT is a dangerous pesticide
• I mistyped when I created the project

Usage

DDH is usable both as a library and as a stand alone CLI tool and aims to be simple to use in both cases.

Library example

let (files, errors): (Vec<Fileinfo>, Vec<(_, _)>) = ddh::deduplicate_dirs(dirs);
let (shared, unique): (Vec<&Fileinfo>, Vec<&Fileinfo>) = files
                    .par_iter()
                    .partition(|&x| x.get_paths().len()>1);
process_full_output(&shared, &unique, &files, &errors, &arguments);

CLI Install

• Install Rust
• cargo install --git https://github.com/darakian/ddh ddh
• The DDH binary will be installed into $CARGO_HOME/.bin/ddh, which usually is $HOME/.cargo/bin/ddh. This should be in your PATH already if you're using rustup.

CLI Features

DDH supports both a standard output for human comprehension and a parsable json output for custom tools such as ddh-move.

CLI Example

Directory Difference hTool
Jon Moroney jmoroney@hawaii.edu
Compare and contrast directories.

Example invocation: ddh -v duplicates -d /home/jon/downloads /home/jon/documents
Example pipe: ddh -o no -v all -f json -d ~/Downloads/ | someJsonParser.bin

Usage: ddh [OPTIONS]

Options:
  -m, --minimum [<MIN_SIZE>]
          Minimum file size in bytes to consider [default: 0]
  -b, --blocksize [<BLOCKSIZE>]
          Set the display blocksize to Bytes, Kilobytes, Megabytes or Gigabytes [default: K] [possible values: B, K, M, G]
  -v, --verbosity [<VERBOSITY>]
          Set verbosity for printed output [default: quiet] [possible values: quiet, duplicates, all]
  -o, --output [<OUTPUT>]
          Set file to save all output. Use 'no' for no file output [default: Results.txt]
  -f, --format [<FMT>]
          Set output format [default: standard] [possible values: standard, json]
  -i, --ignore <IGNORE_DIRS>
          Directories to ignore (comma separated list)
  -d, --directories <DIRECTORIES>...
          Directories to parse
  -h, --help
          Print help information (use `--help` for more detail)
  -V, --version
          Print version information

How Does DDH Work?

DDH works by hashing files to determine their uniqueness and, as such, depends heavily on disk speeds for performance. The algorithmic choices in use are discussed here.