Scala: run external script with dash multiple arguments

Question

As reported here Execute external command in order to run an external shell command or script in Scala the right code should be:

import scala.sys.process._
val cmd = "ls -l /home" // Your command
val output = cmd.!! // Captures the output

I've noticed this works for some commands but not for others like "java -version" (especially if they have dash "-" before arguments)

Is there a correct way to execute commands like "python --version" or a more complex python script like "python /path/to/my_script.py -x value -y value" ?

Mario Galic · Accepted Answer · 2021-06-09 23:40:43Z

2

Seems to work with dashes

$ scala
Welcome to Scala 2.13.6 (Eclipse OpenJ9 VM, Java 1.8.0_292).
Type in expressions for evaluation. Or try :help.

scala> import scala.sys.process._
import scala.sys.process._

scala> "java -version".!!
openjdk version "1.8.0_292"
...

scala> "python3 --version".!!
val res1: String =
"Python 3.8.5
"

answered Jun 9, 2021 at 23:40

Mario Galic

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1 Comment

Mave751 Over a year ago

Yes, it works. I've fined out it was a bug of the application (Lucidworks Fusion 4.2.5) I'm using for my project.

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