args, a FORTRAN90 code which demonstrates command line argument retrieval.

In particular, the code is a demonstration of the IARGC and GETARG routines, commonly available on UNIX systems.

These routines allow a FORTRAN program to count and retrieve the command line arguments with which it was invoked. Thus, if an executable program is called fu and we invoke it with the command

fu man chu
then IARGC will return the value 2, and GETARG, with an input of 0, 1 or 2, will return the values fu, man or chu.


The computer code and data files described and made available on this web page are distributed under the MIT license


args is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.

Related Data and Programs:


GFORTRAN_INTRINSICS, a FORTRAN90 code which demonstrates the use of intrinsic programs provided by the GFORTRAN compiler, which include versions of IARGC and GETARG.

Source code:

Last revised on 26 August 2021.