create a scheduled task using PowerShell

gistfile1.txt

#use http://msdn.microsoft.com/en-us/library/windows/desktop/bb736357(v=vs.85).aspx for API reference

Function Create-ScheduledTask($TaskName,$RunAsUser,$TaskRun,$Schedule,$StartTime,$StartDate,$user, $password){
    
    $cmdStartDate = if([string]::IsNullOrWhiteSpace($StartDate)){""}else{"/sd $StartDate"}
    $cmdStartTime = if([string]::IsNullOrWhiteSpace($StartTime)){""}else{"/st $StartTime"}
    $cmdInterval = if([string]::IsNullOrWhiteSpace($Interval)){""}else{"/ri $Interval"}
    $cmdDuration = if([string]::IsNullOrWhiteSpace($Duration)){""}else{"/du $Duration"}

    $Command = "schtasks.exe /create /ru $User /rp $Password /tn `"$TaskName`" /tr `"'$($TaskRun)'`" /sc $Schedule $cmdStartDate $cmdStartTime /F $cmdInterval $cmdDuration"
    
    echo $Command          
    Invoke-Expression $Command            
 }

Function Delete-ScheduledTask($TaskName) {   
    $Command = "schtasks.exe /delete /s localhost /tn `"$TaskName`" /F"            
    Invoke-Expression $Command 
}

Function Stop-ScheduledTask($TaskName) {  
    $Command = "schtasks.exe /end /s localhost /tn `"$TaskName`""            
    Invoke-Expression $Command 
}

Function Start-ScheduledTask($TaskName) {   
    $Command = "schtasks.exe /run /s localhost /tn `"$TaskName`""            
    Invoke-Expression $Command 
}

Function Enable-ScheduledTask($TaskName) {  
    $Command = "schtasks.exe /change /s localhost /tn `"$TaskName`" /ENABLE"            
    Invoke-Expression $Command 
}

Function ScheduledTask-Exists($taskName) {
   $schedule = new-object -com Schedule.Service 
   $schedule.connect() 
   $tasks = $schedule.getfolder("\").gettasks(0)

   foreach ($task in ($tasks | select Name)) {
      #echo "TASK: $($task.name)"
      if($task.Name -eq $taskName) {
         #write-output "$task already exists"
         return $true
      }
   }

   return $false
} 


#$taskName = $OctopusParameters['TaskName']
#$runAsUser = $OctopusParameters['RunAsUser']
#$command = $OctopusParameters['Command']
#$schedule = $OctopusParameters['Schedule']
#$startTime = $OctopusParameters['StartTime']
#$startDate = $OctopusParameters['StartDate']
#$interval = $OctopusParameters['Interval']
#$duration = $OctopusParameters['Duration']
#$User = $OctopusParameters['User']
#$Password = $OctopusParameters['Password']

$taskName = 'test task'
#$command = $OctopusParameters['Command']
$schedule = 'Weekly'
$startTime = "03:00"
$startDate = "09/04/2015"
#$interval = $OctopusParameters['Interval']
#$duration = $OctopusParameters['Duration']
$User = "usernamegoeshere"
$Password = "pwdgoeshere"

if((ScheduledTask-Exists($taskName))){
    Write-Output "$taskName already exists, Tearing down..."
    Write-Output "Stopping $taskName..."
    Stop-ScheduledTask($taskName)
    Write-Output "Successfully Stopped $taskName"
    Write-Output "Deleting $taskName..."
    Delete-ScheduledTask($taskName)
    Write-Output "Successfully Deleted $taskName"
}

Write-Output "Creating Scheduled Task - $taskName"
Create-ScheduledTask $taskName $runAsUser $command $schedule $startTime $startDate $user $password
Write-Output "Successfully Created $taskName"
Enable-ScheduledTask($taskName)
Write-Output "$taskName enabled"