Custom M-Codes dont work

python ./M104 100

#!/bin/bash

## sets scale gain to make output speed accurate
## for each of 4 pulley settings

if [ ! $# -ge 1 ]; then
  echo "Usage: M101 Pn - where n is speed range 1 - 4"
  exit 1
fi

##echo "param 2 is $2"
## emc takes the M101 P3 for example and passes 
## $1 as 3.000000 and $2 as -1.000000 (because Q was not set)
## to this script!!!
## need to convert to int first

float=$1
int=${float/\.*}
# DEBUG	echo "$float converted to $int"


case $int in

    1 ) halcmd setp scale.0.gain 0.595;;
#       accurate at 1200 in M4 for turning

    2 ) halcmd setp scale.0.gain 1.16;;
#       accurate at 600 in M4 for turning

    3 ) halcmd setp scale.0.gain 2.175;;
#       accurate at 300 in M3 for threading

    4 ) halcmd setp scale.0.gain 4.3;;
#       accurate at 150 in M3 for threading
esac

exit 0