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(ns alexcoding.sandbox.appendnumforfile)

(require '[clojure.string :as str])

(def allwords (atom []))

;; 读取文件到allwords里
(with-open [r (clojure.java.io/reader "/tmp/5.txt")]
  (doseq [line (line-seq r)]
    (swap! allwords conj (str/join "" (take 1 (str/split line #"\t"))))))

(println (count @allwords))

;; 合并到output
(with-open [w (clojure.java.io/writer "/tmp/output.txt" :append true)]
  (doseq [line @allwords]
    (.write w line)
    (.newLine w)))