GET_COMMAND_ARGUMENT — Get command line arguments#

GET_COMMAND_ARGUMENT(NUMBER, VALUE, LENGTH, STATUS)#

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

Parameters:

NUMBER – Shall be a scalar of type INTEGER and of default kind, NUMBER geq 0
VALUE – (Optional) Shall be a scalar of type CHARACTER and of default kind.
LENGTH – (Optional) Shall be a scalar of type INTEGER and of default kind.
STATUS – (Optional) Shall be a scalar of type INTEGER and of default kind.

Returns:

After GET_COMMAND_ARGUMENT returns, the VALUE argument holds the NUMBER -th command line argument. If VALUE cannot hold the argument, it is truncated to fit the length of VALUE. If there are less than NUMBER arguments specified at the command line, VALUE will be filled with blanks. If NUMBER = 0, VALUE is set to the name of the program (on systems that support this feature). The LENGTH argument contains the length of the NUMBER -th command line argument. If the argument retrieval fails, STATUS is a positive number; if VALUE contains a truncated command line argument, STATUS is -1; and otherwise the STATUS is zero.

Standard:

Fortran 2003 and later

Class:

Subroutine

Syntax:

CALL GET_COMMAND_ARGUMENT(NUMBER [, VALUE, LENGTH, STATUS])

Example:

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

  i = 0
  DO
    CALL get_command_argument(i, arg)
    IF (LEN_TRIM(arg) == 0) EXIT

    WRITE (*,*) TRIM(arg)
    i = i+1
  END DO
END PROGRAM