demo_process_readline Program

    program demo_process_readline
    use M_process ,ONLY: process_open_read, process_readline
    use M_process ,ONLY: streampointer, process_close
    implicit none
    type(streampointer) :: fp
    ! line of data to read (assumed long enough to hold any output line)
    character(len=4096) :: line
    integer             :: ierr
      ! open process to read from
      call process_open_read('ls -l',fp,ierr)
      write(*,*)'READLINE: process is opened with status ',ierr
      ierr=0
      do while(ierr .eq. 0)
        ! read a line from the process
        call process_readline(line,fp,ierr)
        if(ierr.ne.0)then
          write(*,*)'READLINE: ierr is ',ierr
          exit
        endif
        write(*,*)'READLINE: ',trim(line)
      enddo
      call process_close(fp,ierr)
      write(*,*)'READLINE: process closed with status ',ierr
    end program demo_process_readline