Run tasks on timers in PowerShell

You can use PowerShell to run tasks on periodic timers. For example, let's say you want to clean a folder containing old log files every hour. Instead of using your operating system's task scheduler (i.e. systemd on Linux, MacOS, or Windows Task Scheduler), you can use PowerShell to create a timer.

The .NET Framework has a class named Timer in the System.Timers namespace, defined in System.ComponentModel.TypeConverter.dll. There are two constructors for the Timer class, one with zero parameters and one that accepts a single "double/" value as input. The value /"double/" is the interval, in milliseconds, over which the timer will run.

Once you've created a Timer object, you use the Register-ObjectEvent command to register for the .NET /"Elapsed/" event. On this same command, the -Action parameter allows you to specify a PowerShell ScriptBlock (aka anonymous function) that will be executed every time the Timer runs out.

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