Pass a variable from Java to a Shell script

Question

I am trying to run a shell script from a Java code. At the moment I am providing data manually in the script, but I would like to be able to provide the variables from the Java

Answer 1

Use shell variables in the script, set them in Java through the environment:

import java.util.Map;

class so1 {

    public static void main(String[] args) {

        try {
            ProcessBuilder pb = new ProcessBuilder("/home/...sh");
            Map<String, String> env = pb.environment();
            env.put("VAR1", "something");
            Process p = pb.start();    
            p.waitFor();              
            System.out.println("Script executed successfully");
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}

In the script:

/usr/local/virtuoso-opensource/bin/isql 1111 dba dba exec="SPARQL CREATE GRAPH $VAR1;"&

Answer 2

You can pass params to your shell script and use them inside de script, The Class ProcessBuilder have a constructor that take the command to execute and the list of parameters to pass to the executable :

ProcessBuilder(String... command)

you have to pass params like this :

 ProcessBuilder pb = new ProcessBuilder("/home/najib/upload.sh",param1,param2,param3);

inside the script param1 is $1 , param2 is $2 , and param3 is $3 (you can pass in the constructor as many arguments as you want )