How to read command line arguments

ReadArgs.java

class ReadArgs {
  public static void main(String[] args) {
    System.out.println(args.length);
    if (args.length >= 1) {
      System.out.println("Running commands in file: " + args[0]);
    } else {
      System.out.println("No args provided. Running in interactive mode");
    }
  }
}

/*
~/scratch
▶ javac ReadArgs.java

~/scratch
▶ java ReadArgs hello
1
Running commands in file: hello

~/scratch
▶ java ReadArgs mp4.in
1
Running commands in file: mp4.in

~/scratch
▶ java ReadArgs
0
No args provided. Running in interactive mode
*/