bashfortraninteractive

Passing arguments to interactive fortran program

I have a fortran program (which I cannot modify) that requires several inputs from the user (in the command line) when it is run. The program takes quite a while to run, and I would like to retain use of the terminal by running it in the background; however, this is not possible due to its interactive nature.

Is there a way, using a bash script or some other method, that I can pass arguments to the program without directly interacting with it via the command line?

I'm not sure if this is possible; I tried searching for it but came up empty, though I'm not exactly sure what to search for.

Thank you!

ps. I am working on a unix system where I cannot install things not already present.

Solution

  • You can pipe it in:

    $ cat delme.f90
program delme
    read(*, *) i, j, k
    write(*, *) i, j, k
end program delme

$ echo "1 2 3" | ./delme
           1           2           3

$ echo "45 46 47" > delme.input
$ ./delme < delme.input
          45          46          47

$ ./delme << EOF
> 3 2 1
> EOF
           3           2           1