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Monitor system resources

shell: 
  type: powershell

sensor:
  - platform: shell
    name: "RAM Usage"
    id: ram_usage
    icon: mdi:memory
    state_class: "measurement"
    unit_of_measurement: "%"
    update_interval: 30s
    command: |-
      Get-WmiObject Win32_OperatingSystem -Property * | % {([math]::Round(($_.FreePhysicalMemory)/$_.totalvisiblememorysize,2))}

shell: 

sensor:
  - platform: shell
    name: "RAM Usage"
    id: ram_usage
    icon: mdi:memory
    state_class: "measurement"
    unit_of_measurement: "%"
    update_interval: 30s
    command: |-
      free | grep Mem | awk '{print $3/$2 * 100.0}'