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Any way to tell on linux if program is started from a terminal?

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  Any way to tell on linux if program is started from a terminal? Knute Johnson <knute2020@585ranch.com> - 2020-12-28 15:44 -0600
    Re: Any way to tell on linux if program is started from a terminal? Andreas Leitgeb <avl@logic.at> - 2020-12-28 22:35 +0000
      Re: Any way to tell on linux if program is started from a terminal? Knute Johnson <knute2020@585ranch.com> - 2020-12-28 20:07 -0600

#39651 — Any way to tell on linux if program is started from a terminal?

Any way to tell on linux if a program is started from a terminal versus 
started from clicking on an icon?

Thanks,

knute

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#39652

Knute Johnson <knute2020@585ranch.com> wrote:
> Any way to tell on linux if a program is started from a terminal versus 
> started from clicking on an icon?

Maybe
https://docs.oracle.com/en/java/javase/11/docs/api/java.desktop/java/awt/GraphicsEnvironment.html#isHeadless()

or
https://docs.oracle.com/javase/7/docs/api/java/lang/System.html#console()
(compare result with null)

depending on what you want to get if both console and X11 is available.

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#39653

On 12/28/20 4:35 PM, Andreas Leitgeb wrote:
> Knute Johnson <knute2020@585ranch.com> wrote:
>> Any way to tell on linux if a program is started from a terminal versus
>> started from clicking on an icon?
> 
> Maybe
> https://docs.oracle.com/en/java/javase/11/docs/api/java.desktop/java/awt/GraphicsEnvironment.html#isHeadless()
> 
> or
> https://docs.oracle.com/javase/7/docs/api/java/lang/System.html#console()
> (compare result with null)
> 
> depending on what you want to get if both console and X11 is available.
> 

The Console test worked perfectly, thanks Andreas!  Here is my test 
program if anybody is interested.  Tested on Xubuntu 20.10 and 
RaspberryPi OS.

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;

public class test5 extends JFrame {
     public test5() {
         super("test5");

         setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

         Console c = System.console();
         JLabel l = new JLabel(c==null ? "null" : 
c.toString(),JLabel.CENTER);
         add(l,BorderLayout.CENTER);

         setSize(400,300);
         setLocationRelativeTo(null);
         setVisible(true);
     }

     public static void main(String... args) {
         EventQueue.invokeLater(() -> new test5());
     }
}

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