[Q] Could use some help with bash script - Android Q&A, Help & Troubleshooting

I am making a init.d script for my kernel and could use another set of eyes that are good with bash script.. I am new to bash script and need to know if this script will work and if not maybe some advice.. I have the on/off correct but need to know if sysfs part is correct more specifically is this line correct: [ "`grep START_BUTTON=$S1 $MAC_CONF`" ] && [ "`grep END_BUTTON!=$S1 $MAC_CONF`" ];
Code:
##########################
# MAC Sweep2Wake Configuration
#
# Sweep2Wake
# 1 to enable Sweep2Wake (default)
# 0 to disable Sweep2Wake
SWEEP2WAKE=1
# Sweep2Wake sysfs
#
S0="BACK"
S1="HOME"
S3="MENU"
# Start button
# BACK
# HOME
START_BUTTON=$S0
# End button
#
# MENU
# HOME
END_BUTTON=$S3
##########################
Code:
#!/system/bin/sh
MAC_CONF="/system/etc/mac.conf"
#Sweep2Wake
#
if [ "`grep SWEEP2WAKE=0 $MAC_CONF`" ]; then
echo 0 > /sys/android_touch/sweep2wake;
echo "[03S2W]: Sweep2Wake disabled.";
else
echo 1 > /sys/android_touch/sweep2wake;
echo "[03S2W]: Sweep2Wake enabled.";
fi
# Sweep2Wake sysfs
# Start
#
if [ "`grep START_BUTTON=$S0 $MAC_CONF`" ]; then
echo "Start Key -$S0-"
echo 'BACK' > /sys/android_touch/sweep2wake_startbutton
elif [ "`grep START_BUTTON=$S1 $MAC_CONF`" ] && [ "`grep END_BUTTON!=$S1 $MAC_CONF`" ]; then
echo "Start Key -$S1-"
echo 'HOME' > /sys/android_touch/sweep2wake_startbutton
else
echo "End Key Not Found"
fi
# Sweep2Wake sysfs
# End
#
if [ "`grep END_BUTTON=$S3 $MAC_CONF`" ]; then
echo "End Key -$S3-"
echo 'MENU' > /sys/android_touch/sweep2wake_endbutton
elif [ "`grep END_BUTTON=$S1 $MAC_CONF`" ] && [ "`grep START_BUTTON!=$S1 $MAC_CONF`"]; then
echo "Start Key -$S2-"
echo 'HOME' > /sys/android_touch/sweep2wake_startbutton
else
echo "End Key Not Found"
fi

---

ok fixed
Code:
##########################
# MAC Sweep2Wake Configuration
#
# Sweep2Wake
# 1 to enable Sweep2Wake (default)
# 0 to disable Sweep2Wake
SWEEP2WAKE=1
# Sweep2Wake sysfs
#
S0="BACK"
S1="HOME"
S3="MENU"
# Start button
# BACK
# HOME
START_BUTTON=$S0
# End button
#
# MENU
# HOME
END_BUTTON=$S3
##########################
#!/system/bin/sh
MAC_CONF="/sdcard/mac.conf"
#Sweep2Wake
#
if [ "`grep SWEEP2WAKE=0 $MAC_CONF`" ]; then
echo 0 > /sys/android_touch/sweep2wake;
echo "[03S2W]: Sweep2Wake disabled.";
else
echo 1 > /sys/android_touch/sweep2wake;
echo "[03S2W]: Sweep2Wake enabled.";
fi
# Sweep2Wake sysfs
# Start
#
if [ "`grep START_BUTTON=$S0 $MAC_CONF`" ]; then
echo "Start Key -$S0-"
echo 'BACK' > /sys/android_touch/sweep2wake_startbutton
elif [ "`grep START_BUTTON=$S1 $MAC_CONF`" ] && [ "`grep END_BUTTON=$S3 $MAC_CONF`" ]; then
echo "Start Key -$S1-"
echo 'HOME' > /sys/android_touch/sweep2wake_startbutton
else
echo "Start Key Not Found"
fi
# Sweep2Wake sysfs
# End
#
if [ "`grep END_BUTTON=$S3 $MAC_CONF`" ]; then
echo "End Key -$S3-"
echo 'MENU' > /sys/android_touch/sweep2wake_endbutton
elif [ "`grep START_BUTTON=$S0 $MAC_CONF`" ] && [ "`grep END_BUTTON=$S1 $MAC_CONF`" ]; then
echo "End Key -$S1-"
echo 'HOME' > /sys/android_touch/sweep2wake_startbutton
else
echo "End Key Not Found"
fi