evtest-4finger-tap.sh

#!/usr/bin/sh 

# i am not very good with bash, but looks like its working fine
########################################################
#
#  evtest /dev/input/event14 | ./4click.sh 'notify-send tap4' | sh
#
########################################################
cancelTap=true

while read -r line; do
  IFS=" "
  eventArray=($line)

  touchEvent=${eventArray[8]}
  touchValue=${eventArray[10]}
  touchTime=${eventArray[2]}

  needleEvent="(BTN_TOOL_QUADTAP),"
  cancelEvent="(ABS_MT_POSITION_X),"
  
  if [ x"$touchEvent" == x"$cancelEvent" ]; then 
    cancelTap=true 
  fi

  if [ x"$touchEvent" = x"$needleEvent" ]; 
  then
    #tapTime=${touchTime##*.}
    if [ x"$touchValue" == x"0" ]; then # fingersUp
      if ! $cancelTap; then
        echo "$1" 
      fi
    fi
    if [ x"$touchValue" == x"1" ]; then # fingersDOWN
       cancelTap=false
    fi
  fi
done