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Find files (ff) by name, fast!
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vishaltelangre Enable LTO and improve search speed (#13)
- LTO helps to speedup compile time and reduce binary size
- Included benchmark results
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src Enable LTO and improve search speed (#13) Mar 4, 2019
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Find Files (ff)

Build Status Version info

Find Files (ff) utility recursively searches the files whose names match the specified RegExp pattern in the provided directory (defaults to the current directory if not provided).

Dual-licensed under MIT or the UNLICENSE.




Download the latest precompiled executable ff binary for your platform from the releases page.

If you're a Rust programmer, download and install ff command using cargo install find-files. To update to a newer version, use the --force flag.

Benchmark Results

$ hyperfine                                \
    --warmup 3                             \
    --export-markdown \
    "find . -iregex '.*[0-9]\.jpg$'"       \
    "find . -iname '*[0-9].jpg'"           \
    "fd -HI '.*[0-9]\.jpg$'"               \
    "ff .*[0-9]\.jpg$"

Benchmark #1: find . -iregex '.*[0-9]\.jpg$'
  Time (mean ± σ):      42.8 ms ±   5.5 ms    [User: 11.7 ms, System: 30.1 ms]
  Range (min … max):    31.2 ms …  56.9 ms    48 runs

Benchmark #2: find . -iname '*[0-9].jpg'
  Time (mean ± σ):      60.8 ms ±   7.2 ms    [User: 27.9 ms, System: 31.4 ms]
  Range (min … max):    44.0 ms …  76.2 ms    37 runs

Benchmark #3: fd -HI '.*[0-9]\.jpg$'
  Time (mean ± σ):      18.8 ms ±   5.3 ms    [User: 14.9 ms, System: 19.9 ms]
  Range (min … max):    11.2 ms …  41.6 ms    96 runs

Benchmark #4: ff .*[0-9]\.jpg$
  Time (mean ± σ):      18.7 ms ±   4.6 ms    [User: 15.7 ms, System: 22.5 ms]
  Range (min … max):    11.7 ms …  30.4 ms    123 runs

  'ff .*[0-9]\.jpg$' ran
    1.00 ± 0.37 times faster than 'fd -HI '.*[0-9]\.jpg$''
    2.29 ± 0.63 times faster than 'find . -iregex '.*[0-9]\.jpg$''
    3.25 ± 0.88 times faster than 'find . -iname '*[0-9].jpg'
Command Mean [ms] Min…Max [ms]
find . -iregex '.*[0-9]\.jpg$' 42.8 ± 5.5 31.2…56.9
find . -iname '*[0-9].jpg' 60.8 ± 7.2 44.0…76.2
fd -HI '.*[0-9]\.jpg$' 18.8 ± 5.3 11.2…41.6
ff .*[0-9]\.jpg$ 18.7 ± 4.6 11.7…30.4


NOTE: Sometimes, fd is a bit faster than ff by approximately 1 ms to 2 ms.



    -s, --case-sensitive      Search case sensitively. By default, files are
                              searched case insensitively.
    -h, --help                Prints help information
    -G, --ignore-gitignore    Ignore searching files and directories specified
                              in .gitignore. By default, the files and
                              directories specified in .gitignore are included
                              in the search results.
    -H, --ignore-hidden       Ignore searching hidden files and directories. By
                              default, hidden files and directories are included
                              in the search results.
    -V, --version             Prints version information

    -x, --exclude <exclude>    Exclude files and directories matching this
                               regular expression from the search results.
    -j, --threads <threads>    The approximate number of threads to use. A value
                               of 0 (which is the default) results in thread
                               count set to available CPU cores.

    <PATTERN>      Find files whose name (path) matches this substring or
                   the regular expression.
    <ROOT_PATH>    Path to the directory to search files inside.[default:


There are a tons of possibilities to search files using ff. Following examples demonstrate just a tip of an iceberg.

  • List paths of files recursively in the current working directory matching article string.
ff article
  • List files having .png, or .PNG extension.
ff png$
  • List files having strict .PNG extension.
ff -s PNG$
  • Search various image files.
ff "\.(png|jpg|jpeg|gif|svg)$"
  • List files whose path matches controllers string.
ff controllers
  • Search .js files in ./spec directory.
ff \.js ./spec
  • Search a file which is expected to be inside hidden .git directory whose name contains commit or something similar.
$ ff git.*commit

# omitted other results
  • Do not show hidden files and directories in the search results.
ff something -H
  • Do not show those files and directories in the search results which are enlisted in .gitignore.
ff src/.*js$ -G

Without -G (--ignore-gitignore) flag in the above command, it also includes the results in the directories such as node_modules by default.

  • Exclude (omit) files and directories which match the provided optional exclude RegExp pattern.
ff rb$ app/controllers -x /(audit|admin|sso|api)/

Above command will show paths of all files whose name ends with rb inside the relative app/controllers directory excluding the paths which match /(audit|admin|sso|api)/ pattern.

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