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RAIN(6) Games Manual RAIN(6)

rain
animated raindrops display

rain [
-d delay
]

rain is modeled after the VAX/VMS program of the same name.
To obtain the proper effect, the -d option may be used to specify a delay in milliseconds between each update. Reasonable values are around 20–200. The default is based on the terminal speed, computed via the following formula:
delay = speed / 9600 - 1
As with any curses(3) program, the TERM environment variable must be set (and exported) to the type of the terminal being used.

Eric P. Scott
January 15, 2015 OpenBSD-current