The FORM specifier asks whether a file is connected for formatted or
unformatted data transfer. It takes the following form:
FORM = fm
- fm
- Is a character scalar memory reference that is assigned one of
the following values:
- 'FORMATTED': If the file is open for formatted I/O
- 'UNFORMATTED': If the file is open for unformatted I/O
- 'UNKNOWN': If the file is not open
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