CODEWITHSUNDEEP
javaubuntu
Burak Keceli
Burak Keceli

Reputation: 953

How to run a script from Java

I have a script, which is test.sh on Ubuntu. I want to run it from Java. I know I have to use Runtime.getRuntime().exec();

Don't I have to fill the exec parenthesis with the location of test.sh? I am typing /home/main/ss/test.sh

I do not get any error messages but when I searched the folder, I saw that script did not work. How can I fix it?

Upvotes: 1

Views: 1277

Answers (3)

user unknown
user unknown

Reputation: 36229

From looking at your description, how you conclude the script didn't work:

I do not get any error messages but when I searched the folder, I saw that script did not work. How can I fix it?

I conclude, the script creates a new file, and there is none, after starting from Java.

Maybe you assume, that the output of the script will, if sent to the current directory, end in the directory of the script, not in the directory where you started your Java application.

This might be the Desktop, if you start your class from the UI with an Icon as starter, it might be your home or project dir, if you compile the class from hand, or a directory, set up by your IDE, if you develop with eclipse or the like.

If your script writes to an absolute path like /tmp/script.out, you could verify fast, whether this might be your issue.

Upvotes: 0

Brian Knoblauch
Brian Knoblauch

Reputation: 21369

Did you try to call your script directly, or did you specify a shell to use? You may need to specify the shell on your exec call if it's not specified (and processed) from the first line of the script.

Upvotes: 0

Sapan Diwakar
Sapan Diwakar

Reputation: 10946

You should really look at Process Builder. It is really built for this kind of thing.

 ProcessBuilder pb = new ProcessBuilder("myshellScript.sh", "myArg1", "myArg2");
 Map<String, String> env = pb.environment();
 env.put("VAR1", "myValue");
 env.remove("OTHERVAR");
 env.put("VAR2", env.get("VAR1") + "suffix");
 pb.directory(new File("myDir"));
 Process p = pb.start();

Upvotes: 1

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