#!/bin/bash
set -e
dev=/dev/usb/lp0

# Initialize printer
printf '\x1B@' > $dev

# Set print speed
printf '\x1D(K\2\0' > $dev
printf '21' > $dev

# Set head energizing
printf '\x1D(K\2\0' > $dev
printf 'a4' > $dev  # 0-4, or \x80 for automatic, default=0