Other I/O Statements

• CLOSE unattaches the unit number specified in the statement. This should always be used to add an end of file mark at the closure point. It is an error to close a file that is not open.
• REWIND simply puts the file pointer back to the start.
• BACKSPACE moves the file pointer is moved back one record, however, it often puts the file pointer back to the start, and then fast forwards.
• ENDFILE forces an end-of-file to be written into the file but the file remains open.

The above statements have other specifiers such as IOSTAT,

For example,

    REWIND (UNIT=14)
    BACKSPACE (UNIT=17)
    ENDFILE (17)
    CLOSE (17, IOSTAT=ival)

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