Execute source command from Java

Question

I am having a bash script file which I am calling using the source command in a shell and is setting a number of environment variables. Then I can use all the tools the environment variables are setting.

Now I want to do the same in Java by the use of:

static Runtime run = Runtime.getRuntime();
Process pr = run.exec(command);
pr.waitFor();

I know that source is an internal command and I can not call it from Java.

Is there any other way to set the enviroment variable in that file from java in order to be able to use them in my code later for calling other commands?

Thank you in advance!

John Kugelman · Accepted Answer · 2013-08-22 14:52:53Z

3

Process pr = new ProcessBuilder("/bin/bash", "-c", ". env.sh; " + command).start();

Try something like this, where you both source the script and execute a subsequent command in the same shell process. Effectively you source the script every time you want to execute a command.

answered Aug 22, 2013 at 14:52

John Kugelman

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5 Comments

Kyriakos Over a year ago

Sorry but I am new to this stuff. So After creating the process pr, how am I executing it using my runtime?

Miterion Over a year ago

@Kyriakos In the example above it is executing because of the .start() at the end. You can create the processbuilder before like this: Processbuilder pb = new ProcessBuilder("/bin/bash", "-c", ". env.sh; " + command); and then execute it with: Process p= pb.start();

Kyriakos Over a year ago

I did something like this: String sourcePath [] = {"/bin/bash", "-c", xmosSetEnvCmd + ";" + xcoreCompileCmd}; Then pr =run.exec(sourcePath); and then pr.waitFor(); Which I think is the same! Thank you very much Miterion! Its working

John Kugelman Over a year ago

@Kyriakos ProcessBuilder is preferable to Runtime.exec(), IMO. It has a better API, and Runtime.exec() is actually implemented using ProcessBuilder under the covers.

Kyriakos Over a year ago

Is there a reason for that John?

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