## 9.5.2 BLANK Specifier

The BLANK specifier asks what type of blank control is in effect for a file. It takes the following form:

    BLANK = blnk

blnk
  Is a character scalar memory reference that is assigned one of the following values:

  - 'NULL': If null blank control is in effect for a file open for formatted I/O

  - 'ZERO': If zero blank control is in effect

  - 'UNKNOWN': If no connection exists or if the connection is not for formatted I/O

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