demo_system_gethostname Program

     program demo_system_gethostname
     use M_system, only : system_gethostname
     implicit none
     character(len=:),allocatable :: name
     integer                      :: ierr
        call system_gethostname(name,ierr)
        if(ierr.eq.0)then
           write(*,'("hostname[",a,"]")')name
        else
           write(*,'(a)')'ERROR: could not get hostname'
        endif
     end program demo_system_gethostname