Drive a servo via pwm on the Raspberry Pi from bash

servopwm.sh

#!/bin/bash

# https://learn.adafruit.com/adafruits-raspberry-pi-lesson-8-using-a-servo-motor/software
gpio -g mode 18 pwm
gpio pwm-ms
gpio pwmc 192
gpio pwmr 2000

while [ 1 -gt 0 ]
do
  for i in $(seq 100 200)
  do
    gpio -g pwm 18 ${i}
  done
  for i in $(seq 200 -2 100)
  do
    gpio -g pwm 18 ${i}
  done
done