## 10.6.23 UNIT Keyword

The UNIT keyword specifies the logical unit that connects to the file. It takes the following form:

    [UNIT=] u

u
  Is a numeric expression.

The unit specification must appear in the parameter list unless the unit specifier occupies the first position in the list.

The logical unit may already be connected to a file when an OPEN statement is executed. If this file is not the same as the one to be opened, the OPEN statement executes as if a CLOSE statement had executed just before it.

If the file to be opened is already connected to the unit, or the file specifier (FILE keyword) is not included in the OPEN statement, only the blank specifier (BLANK keyword) can have a value different from the one currently in effect. The position of the file is unaffected.

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