functions/Set-DbaAgentJobOutputFile.ps1

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function Set-DbaAgentJobOutputFile {
    <#
  .Synopsis
   Set the output file for a step within an Agent job.
 
  .DESCRIPTION
   Sets the Output File for a step of an agent job with the Job Names and steps provided dynamically if required
 
  .PARAMETER SqlInstance
   The SQL Server that you're connecting to.
 
  .PARAMETER SQLCredential
   Credential object used to connect to the SQL Server as a different user be it Windows or SQL Server. Windows users are determiend by the existence of a backslash, so if you are intending to use an alternative Windows connection instead of a SQL login, ensure it contains a backslash.
 
  .PARAMETER Job
   The job to process - this list is auto-populated from the server.
 
  .PARAMETER Step
   The Agent Job Step to provide Output File Path for. Also available dynamically
 
  .PARAMETER OutputFile
   The Full Path to the New Output file
 
  .PARAMETER WhatIf
   Shows what would happen if the command were to run. No actions are actually performed.
 
  .PARAMETER Confirm
   Prompts you for confirmation before executing any changing operations within the command.
 
  .PARAMETER Silent
   Replaces user friendly yellow warnings with bloody red exceptions of doom!
 
  .NOTES
   Original Author - Rob Sewell (https://sqldbawithabeard.com)
 
   Website: https://dbatools.io
   Copyright: (C) Chrissy LeMaire, clemaire@gmail.com
   License: GNU GPL v3 https://opensource.org/licenses/GPL-3.0
 
   # todo - allow piping and add -All
 
  .EXAMPLE
   Set-DbaAgentJobOutputFile -SqlInstance SERVERNAME -JobName 'The Agent Job' -OutPutFile E:\Logs\AgentJobStepOutput.txt
 
   Sets the Job step for The Agent job on SERVERNAME to E:\Logs\AgentJobStepOutput.txt
 #>

    [CmdletBinding(SupportsShouldProcess = $true)]
    param (
        [Parameter(Mandatory = $true, HelpMessage = 'The SQL Server Instance',
            ValueFromPipeline = $true,
            ValueFromPipelineByPropertyName = $true,
            ValueFromRemainingArguments = $false,
            Position = 0)]
        [ValidateNotNull()]
        [ValidateNotNullOrEmpty()]
        [Alias("ServerInstance", "SqlServer")]
        [DbaInstanceParameter[]]$SqlInstance,
        [Parameter(Mandatory = $false, HelpMessage = 'SQL Credential',
            ValueFromPipeline = $true,
            ValueFromPipelineByPropertyName = $true,
            ValueFromRemainingArguments = $false)]
        [PSCredential]$SqlCredential,
        [object[]]$Job,
        [Parameter(Mandatory = $false, HelpMessage = 'The Job Step name',
            ValueFromPipeline = $true,
            ValueFromPipelineByPropertyName = $true)]
        [ValidateNotNull()]
        [ValidateNotNullOrEmpty()]
        [object[]]$Step,
        [Parameter(Mandatory = $true, HelpMessage = 'The Full Output File Path',
            ValueFromPipeline = $true,
            ValueFromPipelineByPropertyName = $true,
            ValueFromRemainingArguments = $false)]
        [ValidateNotNull()]
        [ValidateNotNullOrEmpty()]
        [string]$OutputFile,
        [switch]$Silent
    )

    foreach ($instance in $sqlinstance) {
        try {
            $server = Connect-SqlInstance -SqlInstance $instance -SqlCredential $sqlcredential
        }
        catch {
            Write-Message -Level Warning -Message "Failed to connect to: $instance"
            continue
        }

        if (!$Job) {
            # This is because jobname isn't yet required
            Write-Message -Level Warning -Message "You must specify a job using the -Job parameter."
            return
        }

        foreach ($name in $Job) {
            $currentJob = $server.JobServer.Jobs[$name]

            if ($Step) {
                $steps = $currentJob.JobSteps | Where-Object Name -in $Step

                if (!$steps) {
                    Write-Message -Level Warning -Message "$Step didn't return any steps"
                    return
                }
            }
            else {
                if (($currentJob.JobSteps).Count -gt 1) {
                    Write-Message -Level Output -Message "Which Job Step do you wish to add output file to?"
                    $steps = $currentJob.JobSteps | Out-GridView -Title "Choose the Job Steps to add an output file to" -PassThru -Verbose
                }
                else {
                    $steps = $currentJob.JobSteps
                }
            }

            if (!$steps) {
                $steps = $currentJob.JobSteps
            }

            foreach ($jobstep in $steps) {
                $currentoutputfile = $jobstep.OutputFileName

                Write-Message -Level Verbose -Message "Current Output File for $currentJob is $currentoutputfile"
                Write-Message -Level Verbose -Message "Adding $OutputFile to $jobstep for $currentJob"

                try {
                    if ($Pscmdlet.ShouldProcess($jobstep, "Changing Output File from $currentoutputfile to $OutputFile")) {
                        $jobstep.OutputFileName = $OutputFile
                        $jobstep.Alter()
                        $jobstep.Refresh()

                        [pscustomobject]@{
                            ComputerName   = $server.NetName
                            InstanceName   = $server.ServiceName
                            SqlInstance    = $server.DomainInstanceName
                            Job            = $currentJob.Name
                            JobStep        = $jobstep.Name
                            OutputFileName = $currentoutputfile
                        }
                    }
                }
                catch {
                    Stop-Function -Message "Failed to add $OutputFile to $jobstep for $currentJob" -InnerErrorRecord $_ -Target $currentJob
                }
            }
        }
    }
}