How to runCommand() of a bash script with redirected input from file in Mozilla Rhino?

Question

Is it possible to execute external bash script and set another file as input for it using Rhino? e.g. I need to rewrite bash script(exec.sh) with following content:

somescript.sh <fileInput.txt

I've tried many ways but without success:

1. Reading fileInput.txt as input stream and passing to shell:

   var inputStream = new java.io.InputStream(fileInput.txt);
   runCommand( "somescript.sh", inputStream);
   

2. Writing "somescript.sh <fileInput.txt" to additional bash script and calling runCommand():

   message = new FileUtils.writeStringToFile(helpfulScript, "somescript.sh
   runCommand("bash", helpfulScript.getCanonicalPath());
   

Sorry for pure highlight and thanks in advice for any ideas.

Answer 1

You need to pass the input stream in as the input property of an object.

var inputStream = new java.io.FileInputStream("fileInput.txt");
runCommand("somescript.sh", { input: inputStream });

If input is not an InputStream it will be converted to a string and sent to the command directly. Similarly, you can add output and/or err properties to capture the command's standard output and standard error (documentation here).