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9.123 GET_COMMAND_ARGUMENT — Get command line arguments ¶

Description:

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

Standard:

Fortran 2003 and later

Class:

Subroutine

Syntax:

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

Arguments:

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.

Return value:

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.

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

See also:

GET_COMMAND — Get the entire command line, COMMAND_ARGUMENT_COUNT — Get number of command line arguments