ln.ps1

function New-Link {
    param (
        [Parameter(HelpMessage = "make a symbolic link", ParameterSetName = "switch")]
        [Alias("symbolic")]
        [switch] 
        $s,

        [Parameter(HelpMessage = "make a hard link", ParameterSetName = "switch")]
        [Alias("physical", "hard")]
        [switch] 
        $P,

        [Parameter(HelpMessage = "make a junction", ParameterSetName = "switch")]
        [Alias("junction")]
        [switch]
        $j,

        [Parameter(Mandatory = $true, Position = 0, HelpMessage = "The name of the link to access the target")]
        [ValidateNotNullOrEmpty()]
        [string]
        $link_name,

        [Parameter(Mandatory = $true, Position = 1, HelpMessage = "The taget the link directs to.")]
        [ValidateNotNullOrEmpty()]
        [string]
        $target
    )
    
    if ($s) {
        New-Item -Path $link_name -ItemType SymbolicLink -Value $target
    }

    elseif ($P) {
        New-Item -ItemType HardLink -Name $link_name -Target $target
    }

    elseif ($j) {
        New-Item -ItemType Junction -Name $link_name -Target $target
    }
}

Set-Alias -name ln -Value New-Link