(copy input output & opts)
Copies input to output. Returns nil or throws IOException. Input may be an InputStream, Reader, File, byte[], or String. Output may be an OutputStream, Writer, or File. Options are key/value pairs and may be one of :buffer-size buffer size to use, default is 1024. :encoding encoding to use if converting between byte and char streams. Does not close any streams except those it opens itself (on a File).
(ns your-project
(:require [clojure.java.io :as io]))
(defn copy-file [source-path dest-path]
(io/copy (io/file source-path) (io/file dest-path)))
(copy-file "/home/username/squirrel.txt" "/home/username/burt-reynolds.txt")