macos-sleep-prevent.sh

#!/bin/bash

KEY_CODE=55 # Command Key
MAX_IDLE=30

while true; do
    idle=`ioreg -c IOHIDSystem | awk '/HIDIdleTime/ {print int($NF/1000000000); exit}'`
    echo "Current idle: $idle"
    if [[ $idle > $MAX_IDLE ]]; then
        osascript -e "tell application \"System Events\" to key code $KEY_CODE"
        echo "key pressed"
    fi
    sleep 1
done