What does the following do on Linux?

cat <> FIFO |

Where FIFO is a FIFO created in the current directory.


in bash the redirection operator <> causes a file to be opened for both reading and writing (on file descriptor 0 by default, although you can specify another).

see the bash manual page on redirections, section 3.6.10


You can't both read and write onto the same pipe.

  • I think the final pipe is a typo. Someone should edit. – Tobu Jun 13 '10 at 20:49

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