### 8.97 `GETARG` — Get command line arguments

Description:
  Retrieve the POS-th argument that was passed on the command line when the containing program was invoked.

  This intrinsic routine is provided for backwards compatibility with GNU Fortran 77. In new code, programmers should consider the use of the GET_COMMAND_ARGUMENT intrinsic defined by the Fortran 2003 standard.

Standard:
  GNU extension
Class:
  Subroutine
Syntax:
  `CALL GETARG(POS, VALUE)`
Arguments:

  POS | Shall be of type `INTEGER` and not wider than the default integer kind; POS \geq 0
  VALUE | Shall be of type `CHARACTER` and of default kind.
  VALUE | Shall be of type `CHARACTER`.

Return value:
  After `GETARG` returns, the VALUE argument holds the POSth command line argument. If VALUE can not hold the argument, it is truncated to fit the length of VALUE. If there are less than POS arguments specified at the command line, VALUE will be filled with blanks. If POS = 0, VALUE is set to the name of the program (on systems that support this feature).
Example:

                PROGRAM test_getarg
                  INTEGER :: i
                  CHARACTER(len=32) :: arg

                  DO i = 1, iargc()
                    CALL getarg(i, arg)
                    WRITE (*,*) arg
                  END DO
                END PROGRAM

See also:
  GNU Fortran 77 compatibility function: IARGC

  Fortran 2003 functions and subroutines: GET_COMMAND, GET_COMMAND_ARGUMENT, COMMAND_ARGUMENT_COUNT