How to execute system commands?
ClojureClojure Problem Overview
How can I execute system specific commands and get their response in Clojure? For example, let's assume we're on a Linux machine, how can I call top
or free
, and get their results for further processing?
Clojure Solutions
Solution 1 - Clojure
(use '[clojure.java.shell :only [sh]])
(sh "free")
(sh "top" "-bn1")
See also: http://clojuredocs.org/clojure_core/clojure.java.shell/sh
Solution 2 - Clojure
You should be able to use the Java Runtime.exec method as follows:
(import 'java.lang.Runtime)
(. (Runtime/getRuntime) exec "your-command-line-here")
The Runtime.exec method returns a Process object that you can query to get the standard output etc. as needed.
Solution 3 - Clojure
If you are willing to get a little higher in term of abstractions (although no that high), I would recommend Conch, as I found it to make very readable code.
Solution 4 - Clojure
You could use the babashka library to run shell commands in Clojure. An example would be
#!/usr/bin/env bb
(require '[clojure.java.shell :refer [sh]])
(sh "top")