Command Line Argument in Scala

The arguments which are passed by the user or programmer to the main() method are termed as Command-Line Arguments. main() method is the entry point of execution of a program. main() method accepts an array of strings. 
runtime. But it never accepts parameters from any other method in the program. 
Syntax:

def main(args: Array[String])

For accessing our Scala command-line arguments using the args array, which is made available to us implicitly when we extend App. Here is an example.
Example 1: Print all given objects 

Scala

// Scala Program on command line argument
object CMDExample
{
    // Main method
    def main(args: Array[String])
    {
        println("Scala Command Line Argument Example");

        // You pass any thing at runtime
        // that will be print on the console
        for(arg<-args)
        {
            println(arg);
        }
    }
}

To Compile and execute the above program on terminal follow below commands :
First save program CMDExample.scala then open CMD/Terminal and go on that directory where you save your scala program.

Compile: scalac CMDExample.scala 
Execute: scala CMDExample Welcome To GeeksforGeeks! 

Output:

Scala Command Line Argument Example
Welcome
To
GeeksforGeeks!

Example 2: Print some object which is given at runtime 

Scala

// Scala Program on command line argument
object CMDExample
{
    // Main method
    def main(args: Array[String])
    {
        println("Scala Command Line Argument Example");

        // You pass any thing at runtime
        // that will be print on the console
        println(args(0));
        println(args(2));
    }
}

To Compile and execute the above program on terminal follow below commands :

Compile: scalac CMDExample.scala 
Execute: scala CMDExample 1 Welcome To GeeksforGeeks! 2 

Output:

Scala Command Line Argument Example
1
To

Note:If given index not present in array then you find this error