LFTP - Удаление файлов с удаленного сервера при загрузке через зеркало lftp --reverse

Подход awk,

awk '
  $1!="exon" {                       # If the first died is unequal to "exon"
    if(previous)print previous       # If there is a previous line then print it
    print                            # Print the current line
    previous=start=end=exon_seq=""   # Set all variable to an empty string
    next                             # Move on to the next line in the input file
  }
  {
    if(exon_seq) {                   # if there is a sequence of lines with "exon in field 1
      if(start<=$2 && end>=$3)       # if the start value (field 2) of the previous line 
                                     # is less or equal to the current line and the end
                                     # value of the previous line is greater than or
                                     # equal to field 3 of the current line
        next                         # then do nothing and read the next line
      else                           # if there is no overlap,
        print previous               # then print the previous line
    }
    else {                           # if we are not already in the a sequence of 
                                     # "exon" lines, then this is the first one
      exon_seq=1                     # so exon_seq should become 1
    }
    previous=$0; start=$2; end=$3    # `start` become field2, `end` becomes field 3 and
                                     # `previous` becomes the current record (line)
  }
  END{                               # After all lines are processed
    if(previous) print previous      # If there still is a previous line, then print it
  }
' file