## 9.6.21 READONLY Keyword

The READONLY keyword specifies that an existing file can be read or found, but it cannot be written to. It takes the following form:

    READONLY

The Fortran I/O system's default file access privileges are read-write, which can cause run-time I/O errors if the file protection does not permit write access.

The READONLY keyword has no effect on the protection specified for a file. Its main purpose is to allow a file to be read simultaneously by two or more programs. For example, if you wish to open a file for the purpose of reading the file but want to allow others to read the same file while you have it open, specify the READONLY keyword.

For More Information:

For details on file sharing, see your user manual.

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