Send some input to a Terminal window using Java on Mac OS

Question

I can get a terminal window or command prompt to open on either Mac OS or Windows. I want to send a string to that terminal or cmd window using my java.

  String in = " -i " + "\"" + tfIntdta.getText() + "\"";
  String rst = " - r " + "\"" + tfRstplt.getText() + "\"";
  String out = " -o " + "\"" + tfOutdta.getText() + "\""; 
  String strip = " -s" + "\"" + tfStpdta.getText() + "\"";
  String guistring = "-n gui";
  String wd = "\"" + System.getProperty("user.dir");
  String osver = System.getProperty("os.name");
  String app = "";
    if (osver.contains("Mac")){
       app = wd + "/relap5.x\"";
    } else if (osver.contains("Windows")){
       app = "\\relap5.exe";
    } else if (osver.contains("linux")) {
       app = "/relap5.x";
    }
 String run = app + in + rst + out;

So the string would look something like this. "/Users/brianallison/Documents/Java/RELAP5 GUI/issrs/relap5.x" -i "" - r "" -o ""

I want the line above to appear on the terminal or cmd window and execute.

Can't you just execute the string directly? Check Runtime's javacod, you're probably interested in Runtime.exec(String command) or one of it's overloads. Fun fact/product placement: in Groovy, String has an execute method that runs the String as a terminal command. — CptBartender
– CptBartender, Commented May 8, 2015 at 15:03
I have tried this and all it does is open the terminal window. Desktop.getDesktop().open(new File("/Applications/Utilities/Terminal.app")); Runtime.getRuntime().exec(run); — Brian Allison
– Brian Allison, Commented May 8, 2015 at 15:36
Skip the terminal opening - just execute the string, you don't have to explicitly open the terminal. — CptBartender
– CptBartender, Commented May 8, 2015 at 15:51

Community · Accepted Answer · 2017-05-23 11:45:02Z

1

Put your command and parameters in an array:

String[] command = {
    "/Users/brianallison/Documents/Java/RELAP5 GUI/issrs/relap5.x",
    "-i", "Choose your input file",
    "-r", "",
    "-o", ""
};

Then execute using Runtime#exec(String[] cmdarray):

Runtime.getRuntime().exec(command);

This answer has been put together after reading your other two questions from today, here and here.

edited May 23, 2017 at 11:45

CommunityBot

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answered May 8, 2015 at 20:46

Roger Gustavsson

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5 Comments

Brian Allison Over a year ago

Ok so I did the above reference and It gives no error, but my program does no open up. If I double click on my .x program it will open up, without using my Java GUI. This is all it shows in the output window of Netbeans. /Users/brianallison/Documents/Java/RELAP5 GUI/issrs/dist/relap5.x -i "/Users/brianallison/issrs/rs34bil.exe.04.30.2014/run/boiloff.i" -r "/Users/brianallison/issrs/rs34bil.exe.04.30.2014/run/boiloff.r" -o "/Users/brianallison/issrs/rs34bil.exe.04.30.2014/run/boiloff.o"

Brian Allison Over a year ago

My .x file opens a terminal window.

Roger Gustavsson Over a year ago

I'm sorry, but I'm not familiar with MacOS. Perhaps someone else can answer your questions.

Brian Allison Over a year ago

Anyone know about mac and Java?

Roger Gustavsson Over a year ago

Ask a new question and you will reach the whole community. It's likely only I who will notice your comment.

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