A file descriptor
) or file handle
) is a number that the operating system assigns temporarily to a file when it is opened and uses internally when accessing the file. By default, the operating system limits the number of file descriptors/handles that each process may open and the total number of file descriptors/handles that all processes together may consume.
systems, you set the maximum number of open file descriptors using the ulimit
systems, refer to your operating system documentation for detailed information.
Parent topic: Setting up your overall system