I have a PowerShell script that needs to run under multiple hosts (PowerGUI, PowerShell ISE, etc...), but I am having an issue where sometimes a cmdlet doesn\'t exist under one
If the command is in Verb-Noun form then you can use Get-Command with Verb and Noun parameters.
# Usage:
if (Get-Command -Verb Invoke -Noun MyCommand) {
# cmdlet Invoke-MyCommand exists
}
Get-Command -Verb Get -Noun Item
# Output:
# CommandType Name Version Source
# ----------- ---- ------- ------
# Cmdlet Get-Item 7.0.0.0 #Microsoft.PowerShell.Management
Get-Command -Verb Take -Noun One
# No output.
function Take-One { [CmdletBinding()]param() }
Get-Command -Verb Take -Noun One
# Output:
# CommandType Name Version Source
# ----------- ---- ------- ------
# Function Take-One
Tested on Windows PowerShell 5.1 and PowerShell Core 7.0.
Edit 2020-11-09 Additional example. Also usage example (adapted from Keith Hill answer).
This is a simple function to do what you're like to do :)
function Check-Command($cmdname)
{
return [bool](Get-Command -Name $cmdname -ErrorAction SilentlyContinue)
}
How to use (for example):
if (Check-Command -cmdname 'Invoke-WebRequest')
{
Invoke-WebRequest $link -OutFile $destination
}
else
{
$webclient.DownloadFile($link, $destination)
}
Use the Get-Command
cmdlet to test for the existence of a cmdlet:
if (Get-Command $cmdName -errorAction SilentlyContinue)
{
"$cmdName exists"
}
And if you want to ensure it is a cmdlet (and not an exe or function or script) use the -CommandType
parameter e.g -CommandType Cmdlet