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

text="$1"
size="$(printf '%s' "$text" | wc -c)"
size="$(expr "$size" + 3)"
size="$(printf '%04x' "$size" | sed -e 's/\(..\)\(..\)/\\x\2\\x\1/g')"

# Store data
printf '\x1D(k' > $dev
printf "$size" > $dev
printf '\x31\x50\x30' > $dev
printf '%s' "$text" > $dev

# Print data
printf '\x1D(k' > $dev
printf '\x03\0\x31\x51\x30' > $dev

# Cut paper
printf '\x1DVA\0' > $dev