mkfifo - make named pipes
mkfifo "-m mode" filename ...
Create one or more named pipes, in the order specified, with the mode given.
If no mode is given, create them with mode 0666, modified by the umask.
The mode the fifo should be created with.
Numbers must be three octal digits (as for chmod(1).
specified the way you can for chmod(1) (such as
g+w) are also acceptable.
One or more fifo names to create
Jeffrey S. Haemer and Louis Krupp
chmod(1) umask(1) mkfifo(2)