In Unix-like operating systems, /dev/full or the always full device is a special file that always returns No space left on device (symbol ENOSPC) on writing, and provides infinite number of null characters to any process that reads from it (similar to /dev/zero). This device is usually used when testing the behaviour of a program when it encounters a disk full error.
$ echo "Hello world" > /dev/full bash: echo: write error: No space left on device
See also
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