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+# dupl [![Build Status](https://travis-ci.org/mibk/dupl.png)](https://travis-ci.org/mibk/dupl)
+
+**dupl** is a tool written in Go for finding code clones. So far it can find clones only
+in the Go source files. The method uses suffix tree for serialized ASTs. It ignores values
+of AST nodes. It just operates with their types (e.g. `if a == 13 {}` and `if x == 100 {}` are
+considered the same provided it exceeds the minimal token sequence size).
+
+Due to the used method dupl can report so called "false positives" on the output. These are
+the ones we do not consider clones (whether they are too small, or the values of the matched
+tokens are completely different).
+
+## Installation
+
+```bash
+go get -u github.com/golangci/dupl
+```
+
+## Usage
+
+```
+Usage of dupl:
+  dupl [flags] [paths]
+
+Paths:
+  If the given path is a file, dupl will use it regardless of
+  the file extension. If it is a directory it will recursively
+  search for *.go files in that directory.
+
+  If no path is given dupl will recursively search for *.go
+  files in the current directory.
+
+Flags:
+  -files
+        read file names from stdin one at each line
+  -html
+        output the results as HTML, including duplicate code fragments
+  -plumbing
+        plumbing (easy-to-parse) output for consumption by scripts or tools
+  -t, -threshold size
+        minimum token sequence size as a clone (default 15)
+  -vendor
+        check files in vendor directory
+  -v, -verbose
+        explain what is being done
+
+Examples:
+  dupl -t 100
+        Search clones in the current directory of size at least
+        100 tokens.
+  dupl $(find app/ -name '*_test.go')
+        Search for clones in tests in the app directory.
+  find app/ -name '*_test.go' |dupl -files
+        The same as above.
+```
+
+## Example
+
+The reduced output of this command with the following parameters for the [Docker](https://www.docker.com) source code
+looks like [this](http://htmlpreview.github.io/?https://github.com/golangci/dupl/blob/master/_output_example/docker.html).
+
+```bash
+$ dupl -t 200 -html >docker.html
+```