I need help

        XYSCALE=$(expr "scale=4; 4*200*2/$I" | bc -l)
        ZSCALE=$(expr "scale=4; 4*200*$ZTPI/$I" | bc -l)

case $ACME in
    "ROTON" )
        ZTPI=5
        Z_MAXVEL=0.4
        # 24IPM Z-Axis
        ;;
    "HELIX" )
        ZTPI=2
        Z_MAXVEL=2
        # 120IPM Z-Axis
        ;;

    "V90MK2" )
        X_MAX_LIMIT=20.25
        Y_MAX_LIMIT=12.4
        UPRIGHT="SHORT"
        ZBEARINGS=2
        ;;
    "GX2525" | "COMET" )
        X_MAX_LIMIT=26.125
        Y_MAX_LIMIT=25.1152
        ;;
    "GX2550" | "METEOR" )
        X_MAX_LIMIT=26.125
        Y_MAX_LIMIT=52.2
        ;;
    "GX3725" | "ASTEROID" )
        X_MAX_LIMIT=37.25
        Y_MAX_LIMIT=25.1152
        ;;
    "GX3750" | "NEBULA" | "METEORXL" )
        X_MAX_LIMIT=37.25
        Y_MAX_LIMIT=52.2
        ;;
    "GX5050" )
        X_MAX_LIMIT=53.6
        Y_MAX_LIMIT=51
        UPRIGHT="TALL"
        ZBEARINGS=4

# PROBOTIX ini file

[EMC]
MACHINE = REPLACE_MACHINE
DEBUG = 0

[DISPLAY]
#DISPLAY = axis
DISPLAY = probotix-axis
POSITION_OFFSET = RELATIVE
POSITION_FEEDBACK = ACTUAL
#POSITION_UNITS = INCH
MAX_FEED_OVERRIDE = 1.0
MAX_SPINDLE_OVERRIDE = 1.0
DEFAULT_SPINDLE_SPEED = 8000
PROGRAM_PREFIX = /home/probotix/linuxcnc/nc_files
INTRO_GRAPHIC = probotix_splash.gif
INTRO_TIME = 5
INCREMENTS = REPLACE_INC
OPEN_FILE = /home/probotix/linuxcnc/nc_files/PROBOTIX_logo_engrave.ngc
EDITOR = gedit
TOOL_EDITOR = tooledit
PYVCP = pyvcp.xml
#EMBED_TAB_NAME = Camera
#EMBED_TAB_COMMAND = camview-emc -w {XID}

[FILTER]
PROGRAM_EXTENSION = .png,.gif Greyscale Depth Image
png = image-to-gcode
gif = image-to-gcode
PROGRAM_EXTENSION = .py Python Script
py = python
PROGRAM_EXTENSION = .php PHP Script
php = php
PROGRAM_EXTENSION = .ngc2 Filtered NGC File
ngc2 = g-code-filter.php
PROGRAM_EXTENSION = .ngcl Laser NGC File
ngcl = laser-filter.php

[RS274NGC]
PARAMETER_FILE = emc.var
RS274NGC_STARTUP_CODE = REPLACE_RSC
SUBROUTINE_PATH =  /home/probotix/linuxcnc/nc_files/subs
USER_M_PATH = /home/probotix/linuxcnc/nc_files/mcodes

[TASK]
TASK = milltask
CYCLE_TIME = 0.010

[EMCMOT]
EMCMOT = motmod
SHMEM_KEY = 111
COMM_TIMEOUT = 1.0
COMM_WAIT = 0.010
BASE_PERIOD = 100000
SERVO_PERIOD = 1000000

[HAL]
HALFILE = probotix.hal
POSTGUI_HALFILE = postgui.hal
HALUI = halui
CONTROLLER = REPLACE_CONTROLLER

[HALUI]
# add halui MDI commands here (max 64)
MDI_COMMAND = o100 CALL [1]                                    (00)
MDI_COMMAND = o102 CALL [2]                                    (01)
MDI_COMMAND = G10 L20 P0 X0 Y0                                (02)
MDI_COMMAND = G10 L20 P0 Z0                                    (03)
MDI_COMMAND = G53 G0 XREPLACE_X_PARK Y0 Z0                    (04)
MDI_COMMAND = G53 G0 XREPLACE_X_PARK YREPLACE_Y_PARK Z0        (05)
MDI_COMMAND = G53 G0 X0 Y0 Z0                                (06)
MDI_COMMAND = G0 X0 Y0                                        (07)
MDI_COMMAND = REPLACE_RSC M6                                (08)
MDI_COMMAND = M68 E00 Q0                                    (09)
MDI_COMMAND = G10 L2 P0 X0 Y0 Z0                            (10)
MDI_COMMAND = G64 P0.010                                    (11)
MDI_COMMAND    = M68 E0 Q100                                    (12)
MDI_COMMAND    = o103 CALL                                        (13)

[USER_COMMANDS]
NUMBERKEYS = TRUE
USER0 =
USER1 =
USER2 =
USER3 =
USER4 =
USER5 =
USER6 =
USER7 =
USER8 =
USER9 =

[TRAJ]
AXES = REPLACE_AXES
COORDINATES = REPLACE_COORDINATES
LINEAR_UNITS = REPLACE_UNITS
ANGULAR_UNITS = degree
CYCLE_TIME = 0.010
DEFAULT_VELOCITY = REPLACE_DEFAULT_VELOCITY
DEFAULT_ANGULAR_VELOCITY = 1440
MAX_LINEAR_VELOCITY = REPLACE_MAX_LINEAR_VELOCITY
MAX_ANGULAR_VELOCITY = 1440
NO_FORCE_HOMING = 0

[EMCIO]
EMCIO = io
CYCLE_TIME = 0.100
TOOL_TABLE = tool.tbl

[AXIS_0]
TYPE = LINEAR
HOME = 0
MAX_VELOCITY = REPLACE_XY_MAXVEL
MAX_ACCELERATION = REPLACE_XY_MAXACCEL
STEPGEN_MAXACCEL = REPLACE_XY_STEPGEN_MAXACCEL
SCALE = REPLACE_XY_SCALE
FERROR = REPLACE_FERROR
MIN_FERROR = REPLACE_MIN_FERROR
MIN_LIMIT = -REPLACE_XY_MIN_LIMIT
MAX_LIMIT = REPLACE_X_MAX_LIMIT
HOME_OFFSET = -REPLACE_XY_HOME_OFFSET
HOME_SEARCH_VEL = -REPLACE_XY_SEARCH_VEL
HOME_LATCH_VEL = -REPLACE_XY_LATCH_VEL
HOME_IGNORE_LIMITS = 1
HOME_SEQUENCE = 1
#HOME_FINAL_VEL = 3.0

[AXIS_1]
TYPE = LINEAR
HOME = 0
MAX_VELOCITY = REPLACE_XY_MAXVEL
MAX_ACCELERATION = REPLACE_XY_MAXACCEL
STEPGEN_MAXACCEL = REPLACE_XY_STEPGEN_MAXACCEL
SCALE = REPLACE_XY_SCALE
FERROR = REPLACE_FERROR
MIN_FERROR = REPLACE_MIN_FERROR
MIN_LIMIT = -REPLACE_XY_MIN_LIMIT
MAX_LIMIT = REPLACE_Y_MAX_LIMIT
HOME_OFFSET = -REPLACE_XY_HOME_OFFSET
HOME_SEARCH_VEL = -REPLACE_XY_SEARCH_VEL
HOME_LATCH_VEL = -REPLACE_XY_LATCH_VEL
HOME_IGNORE_LIMITS = 1
HOME_SEQUENCE = 1
#HOME_FINAL_VEL = 3.0

[AXIS_2]
TYPE = LINEAR
HOME = 0
MAX_VELOCITY = REPLACE_Z_MAXVEL
MAX_ACCELERATION = REPLACE_Z_MAXACCEL
STEPGEN_MAXACCEL = REPLACE_Z_STEPGEN_MAXACCEL
SCALE = REPLACE_Z_SCALE
FERROR = REPLACE_FERROR
MIN_FERROR = REPLACE_MIN_FERROR
MIN_LIMIT = -REPLACE_Z_MIN_LIMIT
MAX_LIMIT = REPLACE_Z_MAX_LIMIT
HOME_OFFSET = REPLACE_Z_HOME_OFFSET
HOME_SEARCH_VEL = REPLACE_Z_SEARCH_VEL
HOME_LATCH_VEL = REPLACE_Z_LATCH_VEL
HOME_IGNORE_LIMITS = 1
HOME_SEQUENCE = 0

[AXIS_3]
TYPE = ANGULAR
HOME = 0
MAX_VELOCITY = 1440
MAX_ACCELERATION = 4000
STEPGEN_MAXACCEL = 5000
SCALE = 6.6666
FERROR = 5
MIN_FERROR = 1
HOME_IGNORE_LIMITS = 1
HOME_SEQUENCE = 1