On Linux here's a Python program to blink all the keyboard LEDs on and off:
import fcntl
import os
import time
KDSETLED = 0x4B32
SCR_LED = 0x01
NUM_LED = 0x02
CAP_LED = 0x04
console_fd = os.open('/dev/console', os.O_NOCTTY)
all_on = SCR_LED | NUM_LED | CAP_LED
all_off = 0
while 1:
fcntl.ioctl(console_fd, KDSETLED, all_on)
time.sleep(1)
fcntl.ioctl(console_fd, KDSETLED, all_off)
time.sleep(1)
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