CODEWITHSUNDEEP
javalinuxjenkins
Čamo
Čamo

Reputation: 4163

How to get current user name of Linux in Java

I have a Selenium tests written in Java which runs as Jenkins job. I need to have chmod set up to 777 cause otherwise it throws me an error. But I would like to set up chmod properly to somenthing like 775. The problem is that I dont know who is the user which runs the Java tests. I have this code in Java

System.out.println(Runtime.getRuntime().exec("whoami"));

which returns this: Process[pid=2116487, exitValue=0] Can somebody tell me please what is it? Obviously it is not a user I can set up as owner or as a group of the repository.

Thanks.

Upvotes: 3

Views: 2819

Answers (3)

James Mudd
James Mudd

Reputation: 2373

Do you want this?

System.getProperty("user.name")

Upvotes: 0

Mathias
Mathias

Reputation: 324

You are not getting the output of the process "whoami", but the process properties. Try

System.out.println(new Printstream(Runtime.getRuntime().exec("whoami").getOutputStream()));

Upvotes: 1

Matt
Matt

Reputation: 13923

To get the output of the process, you need to attach the InputStream of to the normal output of the subprocess. Then, you can read from it by creating a BufferedReader. To get the first line of the output of the process (on stdout) you can use this code:

Process proc = Runtime.getRuntime().exec("whoami");
BufferedReader stdin = new BufferedReader(new InputStreamReader(proc.getInputStream()));
String username = stdin.readLine();
System.out.println(username);

You can also get the InputStream of the error output of the subprocess (stderr) with proc.getErrorStream() if this should be necessary.

However, there is a better way if you want to get the username of the user executing the VM:

String username = System.getProperty("user.name");
System.out.println(username);

Upvotes: 4

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