Test if executable is in path in PowerShell

Question

In my script I\'m about to run a command

pandoc -Ss readme.txt -o readme.html

But I\'m not sure if pandoc is installed. So I w

Answer 1

Here is a function in the spirit of David Brabant's answer with a check for minimum version numbers.

Function Ensure-ExecutableExists
{
    Param
    (
        [Parameter(Mandatory = $True)]
        [string]
        $Executable,

        [string]
        $MinimumVersion = ""
    )

    $CurrentVersion = (Get-Command -Name $Executable -ErrorAction Stop).Version

    If ($MinimumVersion)
    {
        $RequiredVersion = [version]$MinimumVersion

        If ($CurrentVersion -lt $RequiredVersion)
        {
            Throw "$($Executable) version $($CurrentVersion) does not meet requirements"
        }
    }
}

This allows you to do the following:

Ensure-ExecutableExists -Executable pscp -MinimumVersion "0.62.0.0"

It does nothing if the requirement is met or throws an error it isn't.