You do this with parametersets. If that isn't enough of a hint, let me know; and I'll send you some examples.
-----Original Message----- From: Ben Scott [mailto:mailvor...@gmail.com] Sent: Friday, April 12, 2013 5:20 PM To: NT System Admin Issues Subject: PowerShell - Dependent parameters Hey all, Is it possible to tell PowerShell that a parameter should be considered mandatory *if and only if* another parameter is present? Scenario: I've got a script that can optionally send email (Zawinski's Law). If the -mailTo parameter is specified, it sends mail. If that parameter is specified, the -smtpHost parameter also needs to be specified. So -smtpHost should be considered mandatory, but *only* if -mailTo is specified. Otherwise, -smtpHost does not need to be present (and, indeed, is pointless). I figure this should employ Parameter Sets somehow, but I can't get it to DWIM. Simply specifying the two parameters as having the same parameter set doesn't make the one mandatory. If I specify either parameter (or both) as Mandatory=$true, it becomes mandatory *always*, not just when -mailTo is present. I could just test smtpHost explicitly, and abort the script if it's not set, but the PowerShell mindset seems to be that parameters should be described, and then the runtime does all that for you. Maybe it just can't do this. Currently using PowerShell 2.0, on Win 7 and 2008 R2. Here's my Param block, if it helps: [CmdletBinding()] Param( # things to back up [Parameter(Mandatory=$true)] [string] $include, # disk or network path to backup to [Parameter(Mandatory=$true)] [string] $backupTo, # directory to put log files in [Parameter(Mandatory=$true)] [string] $logDir, # email address to mail report to [Parameter(Mandatory=$false,ParameterSetName='mailTo')] [string] $mailTo, # SMTP host used to send email [Parameter(Mandatory=$false,ParameterSetName='mailTo')] [string] $smtpHost, # option, eject media when done [Parameter()] [switch] $eject = $false, ) -- Ben ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe ntsysadmin ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe ntsysadmin
