FIFO(7) - Linux manual page online | Overview, conventions, and miscellany

First-in first-out special file, named pipe.

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This manual	Reference	Other manuals
fifo(7)	referred by	askpass-fifo(8mandos) \| mkfifo(3) \| open(2) \| pipe(7) \| sd_is_fifo(3) \| signal(7) \| usplash(8mandos)
fifo(7)	refer to	mkfifo(1) \| mkfifo(3) \| open(2) \| pipe(2) \| pipe(7) \| sigaction(2) \| signal(2) \| socketpair(2)