FORTRAN Reference Manual

Introduction to File I/O in the HP NonStop

Environment

FORTRAN Reference Manual—528615-001

5-24

Operations on HP-defined Files

Table 5-6 shows the operations that you can perform on HP-defined files. For

additional information about $RECEIVE and process files, see Section 14, Interprocess

Communication.

Considerations

If your program uses a POSITION statement for a relative file, you cannot rewind or

backspace the file after executing the POSITION statement.

Control Specifiers in I/O Statements

I/O statements are described in Section 7, Statements.

Table 5-7 on page 5-25 describes the most commonly used I/O control specifiers.

Table 5-6. Valid Operations on HP-defined Files

File Type Read Write Rewind Backspace Endfile Position

Magnetic tape Y Y Y Y Y N

Card reader Y N N N N N

Printer, console N Y N N N N

Terminal Y Y N N N N

Process Y Y Y N N N

$RECEIVE Y Y N N N N

EDIT format file Y Y* Y Y* Y* Y*

Unstructured Y Y Y Y Y Y

Entry-sequence Y Y Y N N N

Key-sequence Y Y N N N Y

Relative Y Y Y Y N Y

* Operation is not valid in a FORTRAN program that runs as a NonStop process