# 10 Auxiliary I/O Statements on Tru64 UNIX Systems

This chapter describes the following auxiliary I/O statements that manage files during I/O operations on Tru64 UNIX systems:

- BACKSPACE

  Repositions an open file to the beginning of the preceding record in that file.

- CLOSE

  Terminates the connection between a logical unit and a file or device.

- DELETE

  Deletes a record from a file.

- ENDFILE

  Writes an end-of-file record to a specified unit. When an input statement reads this record, an end-of-file condition results.

- INQUIRE

  Questions the status of specified properties of a file or logical unit.

- OPEN

  Connects a Fortran logical unit to a file or device; declares required attributes for read and write operations.

- REWIND

  Repositions an open file to the beginning of that file.

- UNLOCK

  Frees a record (locked by a previous READ statement) to permit further access to the record.

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