Use function "get_command_as_string"

[gha3mi]

Problem: To get the output of a shell command, you must write it to a temporary file and then read it into Fortran.
See the current version of the subroutine find_number_of_cpus:

   subroutine find_number_of_cpus(this)
      class(linux_nodes), intent(inout) :: this
      integer                           :: nunit
      logical                           :: ex
      character(len=:), allocatable     :: file_name

      ! todo: get total number of linux cpus
      call execute_command_line ("echo $(nproc --all) > /tmp/forclust_ncpus")

      file_name = '/tmp/forclust_ncpus'
      inquire(file=file_name, exist=ex)
      if (ex) then
         open(newunit=nunit, file=file_name, action='read')
         read(nunit, *) this%ncpus
         close(nunit)
      else
         this%ncpus = 1
         ! error stop "file not found: "//file_name
      end if
   end subroutine find_number_of_cpus

Solution: Use the get_command_as_string function in the pipes_module module from here. With this function a new version looks like as follows:

 subroutine find_number_of_cpus(this)
    use :: pipes_module, only: get_command_as_string
    class(linux_nodes), intent(inout) :: this
    character(len=:), allocatable     :: ncpu_char

    ncpu_char = get_command_as_string('nproc --all')
    read(ncpu_char,*) this%ncpus
 end subroutine find_number_of_cpus