Bash script to monitor when computer is Idle and take information

notifyIdle.sh

#!/bin/bash

LOCKFILE=/tmp/notify.pid
HSTFILE=/tmp/history.tmp

if [ -e ${LOCKFILE} ] && kill -0 `cat ${LOCKFILE}`; then
    echo "already running"
    exit
fi

# make sure the lockfile is removed when we exit and then claim it
trap "rm -f ${LOCKFILE}; exit" INT TERM EXIT
echo $$ > ${LOCKFILE}

idle=false
idleAfter=300000     # consider idle after 5 minutes

while true; do
  idleTimeMillis=$(xprintidle)

  if [[ $idleTimeMillis -gt $idleAfter && $idle = false  ]] ; then
    timestart=`date -Iseconds`
    opened=`wmctrl -l | tr "\n" '|'`
    cp ~/.config/google-chrome/Default/History $HSTFILE
    lastview=`sqlite3 $HSTFILE "select distinct(url) from urls order by last_visit_time desc limit 10;" | tr "\n" '|'`
    idle=true
  fi

  if [[ $idleTimeMillis -lt $idleAfter && $idle = true ]] ; then
    read -r -d '' JSONINFO << EOF
    {
        "hostname":  "$(hostname)",
        "timestart": "$timestart",
        "idletime":  "$idleTimeMillis",
        "windows": "$opened",
        "tabs": "$lastview"
    }
EOF
    echo $JSONINFO >> /tmp/lastreport.log
    opened=""
    idle=false
  fi

  sleep 1      # polling interval

done

rm -f ${LOCKFILE}