Public/Test-CrontabSchedule.ps1
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Function Test-CrontabSchedule { <# .SYNOPSIS Tests that a crontab string is valid .DESCRIPTION This function attempts to parse a crontab string to ensure it is valid. .PARAMETER Crontab The datetime value to return the second Tuesday for the month .EXAMPLE Test-CrontabSchedule -crontab '0 17 * * *' Valid schedule that returns: Crontab Valid ------- ----- 0 17 * * * True .EXAMPLE Test-CrontabSchedule -crontab '0 17 * 13 *' Invalid schedule that returns: Crontab Valid ErrorMsg ------- ----- -------- 0 17 * 13 * False 13 is higher than the maximum allowable value for the [Month] field. Value must be between 1 and 12 (all inclusive). .OUTPUTS A psobject that contains the crontable, a validation value, and any error messages returned #> [CmdletBinding()] [OutputType('string')] param( [Parameter(Mandatory = $true)] [string]$Crontab ) $Result = [ordered]@{ Schedule = $Crontab Valid = $false } try { $Result['Schedule'] = [NCrontab.CrontabSchedule]::Parse($Crontab) $Result['Valid'] = $true } catch { $ErrorMsg = $_.Exception.ErrorRecord.ToString() $ErrorMsg = $ErrorMsg.Substring($ErrorMsg.IndexOf(': "') + 3) $ErrorMsg = $ErrorMsg.Substring(0, $ErrorMsg.Length - 1) $Result.Add('ErrorMsg', $ErrorMsg) } [PSCustomObject]$Result } |