Bash script that stops an ec2 instance after 12 consecutive invocations without established ssh connection or screens

stop-if-idle.sh

#!/bin/bash

# This script will check for the absence of any logged in user for 12 consecutive
# invocations.  If the no user has logged in for 12 consecutive invocations then
# the EC2 instance will stop or hibernate depending on its configuration
# The ec2 instance profile must have permission to stop an ec2 instance.
# 
# Copy this script to /usr/local/bin and make it executable
# Then add the following line to your crontab.   
#
# */5 * * * * /usr/local/bin/stop-if-idle
#
# The script will be invoked every 5 minutes and will stop or hibernate the instance
# after the 12th invocation (1hr).  To change the duration, change the frequency of 
# the cron job.  For instance, changing the cron to invoke every 10 minutes will 
# stop or hibernate after 2hrs.  

# Write the current number of ssh connections and screens to login_log
if [ ! -d /var/log/stop-if-idle ]; then mkdir /var/log/stop-if-idle; fi
login_log=/var/log/stop-if-idle/w.log

logins=`w -h | wc -l`
screens=`ls /var/run/screen | wc -l`
vscode=`ps -ef | grep vscode | grep -v grep | wc -l`

echo $((logins + screens + vscode)) >> $login_log

# Prepopulate a 12 element array with 1's.
# Then write the contents of login_log over the array
logins=(1 1 1 1 1 1 1 1 1 1 1 1)
i=0
for val in `tail -12 $login_log`; do
        logins[$i]=$val
        i=$i+1
done

# Compute the number of logins in the last 12 invocations
login_duty_cycle=0
for val in ${logins[@]}; do
        ((login_duty_cycle += $val))
done

# If the number of logins for 12 consecutive invocations is 0 then stop/hibernate
# Remove the login_log upon success so that the script starts over upon resume
if [ $login_duty_cycle -eq 0 ]; then
        instance_id=`curl -s http://169.254.169.254/latest/meta-data/instance-id`
        region=`curl -s http://169.254.169.254/latest/meta-data/placement/region`
        hibernate_configured=`curl -d http://169.254.169.254/latest/meta-data/hibernation/configured`
        if [ $hibernate_configured = 'true' ]; then hibernate='--hibernate'; fi
        aws ec2 stop-instances --region $region --instance-ids $instance_id $hibernate && rm $login_log
fi;

Refined to check for vscode remote sessions