PowerShell Script Scheduler / Automator

This little script is designed for those occasions where you want to schedule / automate the running of a PowerShell script, but are stymied by Enterprise restrictions preventing you from setting up standard Windows scheduled tasks. This PowerShell script will schedule on a daily basis (specific minute - but not exactly on the minute - of a specific hour of specific days of the week.) It’s simple and solves a problem. It does require the user running the script (and whatever script the script needs to run), to remain logged in (and I’d recommend logged into the console session); and after a reboot, the user will need to be logged back in again and the scheduler re-started (perhaps a simple batch file to kick it of.)

The code (formatted for blogger) is below. As always, copy and paste into a text editor and save as say “PS-Script-Scheduler.ps1”.

###########################################

# PowerShell Script Scheduler / Automator #

############################################################

# + Include PS script to be scheduled and all switches.    #

# + Mandatory switches: -Script, -Minute, -Hour, -Days     #

# + Do not abbreviate days of the week!                    #

# + If you don't specify -Runs or set it to 0,             #

#   the program runs infinitely until terminated.          #

# + Usage example:                                         #

# .\PS-Script-Scheduler.ps1 -Script ".\script.ps1 -Sw1"    #

#     -Minute 0 -Hour 6 -Days Tuesday,Friday               #

############################################################

Param(

[Parameter(Mandatory=$true)][String]$Script,

[Parameter(Mandatory=$true)][String]$Minute,

[Parameter(Mandatory=$true)][String]$Hour,

[Parameter(Mandatory=$true)][System.Array]$Days,

[Int]$Runs

)

[Int]$RunsCount = 0

[Boolean]$Triggered = $FALSE

while($TRUE){

# The Script Scheduler checks time every 60 seconds

Start-Sleep 60

$Date = Get-Date

If(!$Triggered){

If($Date.Minute -ge [Int]$Minute){

If($Date.Hour -eq [Int]$Hour){

Foreach($Day in $Days){

If($Date.Dayofweek -eq $Day){

Invoke-Expression $Script

$Triggered = $TRUE

$RunsCount++

"TRIGGERED at $Date"

"Invoked expression:"

"$Script"

}

}

}

}

}

If($Triggered){

If($Date.Hour -ne $Hour){

# Reset the trigger

$Triggered = $FALSE

}

}

If($Runs){

If($RunsCount -ge $Runs){ EXIT }

}

}