how to get the string returned from a call to exec which is in a java.io.OutputStream

Question

I have this:

(import 'java.lang.Runtime)

(defn foo []
    (println (.getOutputStream (. (Runtime/getRuntime) exec "pwd"))))

It successfully returns a java.io.OutputStream (java docs here: http://docs.oracle.com/javase/1.5.0/docs/api/java/io/OutputStream.html

How do I now write this stream using clojure/java interop? I want to get a string of the 'pwd' command.

Thanks

score 1 · Answer 1 · answered Sep 06 '15 at 12:19

1

You can use slurp. Also you have to use getInputStream instead of getOutputStream method (you want to consume the input stream of the process). This snippet should work :

(println (slurp (.getInputStream (.exec (Runtime/getRuntime) "pwd"))))

answered Sep 06 '15 at 12:19

Viktor K.

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score 1 · Answer 2 · answered Sep 07 '15 at 01:58

1

This isn't the direct answer to the question, but thought it might be helpful to others to mention that https://clojuredocs.org/clojure.java.shell/sh would be helpful in this situation as well.

answered Sep 07 '15 at 01:58

ktsujister

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score 0 · Answer 3 · edited May 23 '17 at 10:26

0

Maybe this is not the best way to get the current working directory. Take a look here: Getting the Current Working Directory in Java

edited May 23 '17 at 10:26

Community

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answered Sep 06 '15 at 12:24

benzen

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yes indeed, thanks for the link. i was really using pwd as a basic example! – Zuriar Sep 06 '15 at 12:46

how to get the string returned from a call to exec which is in a java.io.OutputStream

3 Answers3