Some Unix commands for PowerShell

I've been playing with PowerShell a little and decided to make some Unix commands that were not ported over.

 

Command	Function
whoami	function whoami {  [System.Security.Principal.WindowsIdentity]::GetCurrent().Name        }
~ (works better if it was not an alias)	function ~ {    $home }
mkdir	function mkdir([string] $name) {    New-Item $name -type directory }
touch	function touch([string] $path = ".\", [string] $name) {    $file = $path + $name    $result = test-path $file    if($result -eq $true)    {       ##"Changing LastWriteTime"       gci $file | foreach{$_.lastwritetime = $(get-date)}    }    else    {       ##"Creating new file"       new-item $file -type file    } }
find (still currently working on this one. I need to implement wild cards)	function find([string] $name = "", [string] $ext = "", [string] $drive = "C:") {    $computer = "."    if($name -ne "")    {       $files = get-wmiobject -computer $computer cim_datafile -filter "FileName = '$name'"    }    if($ext -ne "")    {       $files = get-wmiobject -computer $computer cim_datafile -filter "Extension = '$ext'"    }    $files | add-member --type PropertySet "FindInfo" ([string[]]("Name","FileType","Extension","CreationDate")) -force    $files | select FindInfo | ft -wrap }

 

I figured re-writing Unix commands might help me learn powershell. I'm going to use http://en.wikibooks.org/wiki/Guide_to_UNIX/Commands as source of basic Unix commands to implement.