OPEN: STATUS Specifier

The STATUS specifier indicates the status of a file when it is opened. It takes the following form:

STATUS = sta

sta

Is a scalar default character expression that evaluates to one of the following values: 'OLD' Indicates an existing file. 'NEW' Indicates a new file; if the file already exists, an error occurs. Once the file is created, its status changes to 'OLD'. 'SCRATCH' Indicates a new file that is unnamed (called a scratch file). When the file is closed or the program terminates, the scratch file is deleted. 'REPLACE' Indicates the file replaces another. If the file to be replaced exists, it is deleted and a new file is created with the same name. If the file to be replaced does not exist, a new file is created and its status changes to 'OLD'. 'UNKNOWN' Indicates the file may or may not exist. If the file does not exist, a new file is created and its status changes to 'OLD'.

Scratch files go into a temporary directory and are visible while they are open. Scratch files are deleted when the unit is closed or when the program terminates normally, whichever occurs first.

To specify the path for scratch files, you can use one of the following environment variables:

• On Windows*: FORT_TMPDIR, TMP, or TEMP, searched in that order

• On Linux* and macOS*: FORT_TMPDIR or TMPDIR, searched in that order

If no environment variable is defined, the default is the current directory.

The default is 'UNKNOWN'. This is also the default if you implicitly open a file by using WRITE. However, if you implicitly open a file using READ, the default is 'OLD'. If you specify compiler option f66 (or OPTIONS/NOF77), the default is 'NEW'.