Powershell - Script that accepts single string param or filelist using Get-Content

Question

I'm having trouble getting PowerShell to accept a single string param input on the command line OR accept a file as input containing a list of servers.

I've tried working this example but I can't get things to work.

I also tried working with param([switch] $FileList) but the IF statement doesn't reach the else block.

What I hope to put together is a script that accepts a single server name passed in on the command line or accepts input from a text file. I do appreciate any pointers!

-edit, using the below running the script with/without a param returns Run on single server and it is the same if (($FileList -eq $false)) Using Keith Hill's example, again no matter what I try passing the script the output is always same (the IF block never reaches the ELSE block)

-Edit2, the second code example works when passing a single server name to the script, the problem for me is trying to get the [Switch] parameter to accept a filename and pass it to the code block with the foreach loop. It errors with the following Get-EventLog : Invalid value '.\fake.txt' for parameter 'machineName'. at the ELSE line.

param([switch] $FileList)
if (($FileList -eq $true)) { "No file list input" }
Else { "Run on single server"}

2nd code example

param(
[switch]$FileList,
[string]$server)

if ($FileList -eq $true) {
$list = GC $FileList
foreach ($server in $list){Get-EventLog -ComputerName $server -LogName system | Where-Object {$_.EventID -eq '6005'} | Select TimeGenerated,Message | Select -first 1}#End foreach
}

Else{
Get-EventLog -ComputerName $server -LogName system | Where-Object {$_.EventID -eq '6005'} | Select TimeGenerated,Message | Select -first 1
}

Edited question to provide more detail. I wasn't able to focus on this until now, apologies for posting an incomplete question. — user4317867
– user4317867, Commented Apr 1, 2015 at 5:24
A [switch] parameter cannot take a value - it's more similar to a boolean. If it's specified in the arguments it becomes $true, otherwise its $false. If you want an array of servers you need to use [string[]]$servers as a parameter — arco444
– arco444, Commented Apr 1, 2015 at 8:56

Bruce · Accepted Answer · 2015-04-01 13:37:47Z

1

If you're set on using the switch parameter this won't help but if you just want a single parameter that can be a file or server name it will.

param (
   [parameter(Mandatory = $true)] [string]$FileList
)

if (Test-Path $FileList) {
  "File found, do file related commands."
}
Else { "Single server actions." }

answered Apr 1, 2015 at 13:37

Bruce

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1 Comment

user4317867 Over a year ago

Ok this looks great, a simple way to accomplish my goal. Looking at the [switch] option, that would only increase the scripts complexity since it would require the user to enter -FileList when the script is run. Thank you!

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