<tbody>
<tr><td class="n"><a href="../">Parent Directory</a>/</td><td class="m"></td><td class="s">- </td><td class="t">Directory</td></tr>
<tr><td class="n"><a href="20091103/">20091103</a>/</td><td class="m">2009-Dec-29 19:31:07</td><td class="s">- </td><td class="t">Directory</td></tr>
<tr><td class="n"><a href="20100116/">20100116</a>/</td><td class="m">2010-Jan-30 01:54:24</td><td class="s">- </td><td class="t">Directory</td></tr>
<tr><td class="n"><a href="20100130/">20100130</a>/</td><td class="m">2010-Mar-26 05:31:56</td><td class="s">- </td><td class="t">Directory</td></tr>
<tr><td class="n"><a href="20100730/">20100730</a>/</td><td class="m">2010-Aug-08 15:59:47</td><td class="s">- </td><td class="t">Directory</td></tr>
<tr><td class="n"><a href="latest/">latest</a>/</td><td class="m">2010-Aug-05 03:46:25</td><td class="s">- </td><td class="t">Directory</td></tr>
</tbody>

$c = gc ".\Desktop\powershell\local_site.txt"
([regex]'<a\s+href=\"\d+/?\">(\d+)</a>').matches($c) | foreach {$_.Groups[1].Value}

Groups   : {20091103, 20091103}
Success  : True
Captures : {20091103}
Index    : 1301
Length   : 32
Value    : 20091103
...
...

$services = Get-WmiObject win32_service | where {$_.StartName -match '^PHX\\*'}
$pwd = "pwd_here"
if ($matches[0] -ne $null)
{
    foreach ($service.Name in $services)
    {
        write-host $service.Name
        $service.Change($null,$null,$null,$null,$null,$null,$null,$pwd,$null,$null,$null)
    }
}

SELECT current_value
FROM msdb.dbo.syspolicy_configuration
WHERE name = N'HistoryRetentionInDays';

exec msdb.dbo.sp_syspolicy_set_config_history_retention [ @value = ] value

function download-files($dldFrom = $(throw "source URL is empty"), $dldTo = $(throw "download to where?"))
{
	# if your company doesn't need a proxy server, you don't need this part
	$proxy = new-object System.Net.WebProxy "your_web_proxy_server:80"
	$proxy.UseDefaultCredentials = $true
	$webclient = new-object System.Net.WebClient
	$webclient.proxy = $proxy
	$webclient.DownloadFile($dldFrom, $dldTo)
}

# Get file properties n compare time difference
$hotlist = get-item "\path\to\file\filename.txt"
$now = [datetime]::now
$diff = $now - $hotlist.LastWriteTime
write-output "Time Diff: " $diff.Minutes
if ($diff.Minutes -ge 30)
{
    "sending mail"
    send-email $emailaddress `
    " - filename.txt is older than 30 minutes" `
    "Please open a ticket to address/investigate why the txt file is older than 30 minutes. The location of the file is: \path\to\file"
    # Keep checking the file until it is -lt 5 minutes
    do
    {
        "checking timestamp"
        sleep 60
        $hotlist = get-item "\path\to\file\filename.txt"
        $now = [datetime]::now
        $diff = $now - $hotlist.LastWriteTime
    }
    until ($diff.Minutes -lt 5)
    {
        "sending green email"
        send-email $emailaddress `
        " - filename.txt up-to-date" `
        "The txt file has been updated less than 1 minute ago"
    }
}

$servers = gc "D:\Patch\bin\not_useServers.txt"
$serviceName = "MpsSvc"
foreach($server in $servers)
{
    $service = get-service -computername $server -name $serviceName
    if($service.Status -eq "Running")
    {
        write-output "Windows firewall is running on: $($server).  Attempting to stop it."
        $service | stop-service
    }
}

function ping-server([string[]]$servers = $(throw "Nothing to Ping!"), $emailaddress = $(throw "empty email list!"))
{
	foreach($server in $servers)
	{
		$result = get-wmiobject win32_pingStatus -f "address = '$($server)'"
		if ($result.StatusCode -ne 0)
		{
		send-email $emailaddress "$($server) is unavailable " "."
		}
	}
}

Usage:
#import the function
. .\ping_server.ps1
#declaring variables
$servers = get-content "d:\listOfServers.txt"
$emailaddress = "abc@xyz.com","def@xyz.com"
#making use of the function
ping-server $servers $emailaddress

invoke-command -computername smtp1 {send-mailmessage -from "abc@def.com" `
    -to "xyz@gogo123.com" `
    -subject "Regarding: http://www.cbtr.net" `
    -body "New section has been added: Powershell "`
    -smtpserver "some.smtp.server"}

$url = "http://www.cbtr.net"
invoke-command -computername smtp1 {send-mailmessage -from "abc@def.com" `
    -to "xyz@gogo123.com" `
    -subject "Regarding: $($url)" `
    -body "New section has been added: Powershell "`
    -smtpserver "some.smtp.server"}

$url = "http://www.cbtr.net"
invoke-command -computername smtp1 {param($url) send-mailmessage -from "abc@def.com" `
    -to "xyz@gogo123.com" `
    -subject "Regarding: $($url)" `
    -body "New section has been added: Powershell "`
    -smtpserver "some.smtp.server"} -ArgumentList $url

$url = "http://www.cbtr.net"
$command = "invoke-command -computername smtp1 {write-host `"hello: $($url)`"}"
$command | invoke-expression

function send-email($from, [string[]]$to, $subject = $(throw "subject required"), $body = $(throw "body required"))
{
    # eg: $a = "abc@xyz.com","gef@xyz.com"
    # eg: send-email "opq@xyz.com" $a "Subject" "Body"
    invoke-command -computername servername {param($from, $to, $subject, $body) send-mailmessage -from $from `
    -to $to `
    -subject $subject `
    -body $body `
    -smtpserver "some.smtp1.server"} -ArgumentList $from, $to, $subject, $body
}