Powershell and Plink

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Being that I am new to powershell; I am trying my best to learn it and to get my first function to work completely.

I have this fuction; it does complete but somewhere I must  have went wrong in my scripting. I want it logon to a switch using plink; I am using the -l, -pw, and -m plink option at least I think I am. Here is what my function script looks lilke:

$SwitchIP = Get-Content C:\Scripts\Brocadeswitch\switchIP.txt
$SwitchLogon = Get-Content C:\Scripts\Brocadeswitch\SwitchLogon.txt
$SwitchPsswd = Get-Content C:\Scripts\Brocadeswitch\Switchpsswd.txt
$SwitchCliCommand = Get-Content C:\Scripts\Brocadeswitch\SwitchCommand.txt
$SwitchLogFile = "C:\Scripts\Brocadeswitch\Brocade-Log-" + (Get-date -f dd ).tostring() + (Get-date -f MM ).tostring() + ((Get-Date).year).tostring() + ".txt"

Function Get-SwitchInformation
{
 param(
[string]$SwitchIP,
[string]$SwitchLogon,
[string]$SwitchPsswd,
[string]$SwitchCliCommand
)

(Get-Date) > $SwitchLogFile

$SwitchIP | % { $_ >> $SwitchLogFile ; & C:\Scripts\Brocadeswitch\plink.exe -l $SwitchLogon  -pw $SwitchPsswd  -m . $SwitchCliCommand $_ >> $SwitchLogFile}

}

When I run it I get this output.

Tuesday, April 22, 2014 12:32:05 PM

PuTTY Link: command-line connection utility
Release 0.63
Usage: plink [options] [user@]host [command]
       ("host" can also be a PuTTY saved session name)
Options:
  -V        print version information and exit
  -pgpfp    print PGP key fingerprints and exit
  -v        show verbose messages
  -load sessname  Load settings from saved session
  -ssh -telnet -rlogin -raw -serial
            force use of a particular protocol
  -P port   connect to specified port
  -l user   connect with specified username
  -batch    disable all interactive prompts
The following options only apply to SSH connections:
  -pw passw login with specified password
  -D [listen-IP:]listen-port
            Dynamic SOCKS-based port forwarding
  -L [listen-IP:]listen-port:host:port
            Forward local port to remote address
  -R [listen-IP:]listen-port:host:port
            Forward remote port to local address
  -X -x     enable / disable X11 forwarding
  -A -a     enable / disable agent forwarding
  -t -T     enable / disable pty allocation
  -1 -2     force use of particular protocol version
  -4 -6     force use of IPv4 or IPv6
  -C        enable compression
  -i key    private key file for authentication
  -noagent  disable use of Pageant
  -agent    enable use of Pageant
  -m file   read remote command(s) from file
  -s        remote command is an SSH subsystem (SSH-2 only)
  -N        don't start a shell/command (SSH-2 only)
  -nc host:port
            open tunnel in place of session (SSH-2 only)
  -sercfg configuration-string (e.g. 19200,8,n,1,X)
            Specify the serial configuration (serial only)

not what I was looking for; it was just a basic switch.

Would please tell me a beginner where I am going wrong or a better way to do what I am trying to do.

Thanks