How to execute bash command in Kotlin

Question

Sorry but I could not find the answer from googling...what is the syntax for running a bash command in kotlin? I would like to do a curl command. The documentation out there seems very limited or maybe I am bad at googling?

I don't see a link to the excellent How to invoke external command from within Kotlin code? — allenjom
– allenjom, Commented Nov 4, 2019 at 17:12

Boris · Accepted Answer · 2017-10-07 18:10:35Z

19

As curl is not a bash-specific application, you can just start it like any other process. Assuming you are using kotlin on the JVM:

val process = ProcessBuilder("curl", "https://example.com").start()
process.inputStream.reader(Charsets.UTF_8).use {
  println(it.readText())
}
process.waitFor(10, TimeUnit.SECONDS)

Instead of using curl you might want to look into kotlin or java libraries, depending on your problem it could be easier and even faster than starting the curl process.

answered Oct 7, 2017 at 18:10

Boris

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2 Comments

Michael Over a year ago

Can I still use external libraries like unirest even if it is a kotlin script ?

Boris Over a year ago

If you are running the script with kotlinc you can just specify the classpath: kotlinc -script test.kts -classpath library.jar

Václav Hodek · Accepted Answer · 2017-10-07 18:06:38Z

11

You can do that simply with Runtime.getRuntime().exec("command line").

Since Kotlin is based on Java, you can find documentation in JavaDoc here: https://docs.oracle.com/javase/7/docs/api/java/lang/Runtime.html#exec(java.lang.String)

answered Oct 7, 2017 at 18:06

Václav Hodek

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