open a temporary file for text functions
(optional) string prefix for the temporary file's name
(optional) string suffix for the temporary file's name
The OpenTemporaryFile() function creates a temporary text file and opens it for writing. It returns a string giving the name of the file, which can be used as a file handle in other file I/O operations. The filename will be of the form MapleXXXXXX, where each X is replaced with a random character.
If the optional prefix is provided, then the generated file name will be of the form prefixXXXXXX.
If both a prefix and suffix are provided, then the generated file name will be of the form prefixXXXXXXsuffix. A prefix must be provided if a suffix is to be specified.
The current implementation of OpenTemporaryFile in not secure. Between generating the unique filename and creating the file, another process may be able to create a file with the same name. By doing so, the other process can read information from or write information into the file.
If no temporary file can be created, an exception is raised.
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