PowerShell Wicca

How to remove headers from table:

format-table -HideTableHeaders

$array1 = (Get-Content C:\Servers.csv) #no header in file            
$array2 = (Get-Content C:\backup.txt) #no header in file            
$array1 | where {$array2 -notcontains $_}            

$ServiceList = Get-Service | Select-Object Name            
foreach ($item in $ServiceList)            
{            
$checkedlistbox1.Items.Add($item.Name)            
}            

Get-Service | Select-Object Name | % { $checkedlistbox1.Items.Add($_.name) }

Special characters that works in PowerShell:

`0    Null            
`a    Alert            
`b    Backspace            
`f    Form feed            
`n    New line            
`r    Carriage return            
`t    Horizontal tab            
`v    Vertical tab            

$SmtpClient = new-object system.net.mail.smtpClient            
$MailMessage = New-Object system.net.mail.mailmessage             
            
$SmtpClient.Host = "smtprelay1.norr.se"            
$mailmessage.from = "bestallning_backup@norr.se"            
$mailmessage.To.add("catherina.holm@norr.se")            
$mailmessage.Subject = “Beställning Backup”            
$mailmessage.Body = “$valdserver $valdip”             
$smtpclient.Send($mailmessage)

$SelServer = $combobox1.SelectedItem            
foreach ($item in $list){             
    switch ($item.Server)            
        {$SelServer             
            {            
            $textbox1.Text = $item.IP_adress             
            $textbox2.Text = $item.iLoKort              
            }            
        }            
}            

$list = $ServerTable | Where-Object {$_.Synlig -eq 'True'} | `
Select-Object Server,IP_adress,iLoKort | Sort-Object Server            
foreach ($item in $list) {            
    $combobox1.items.add($item.Server)            
    }            

$SQLServerName="10.11.12.13"                        
$SQLDatabase="Inventory"             
            
$DBConnection=New-Object System.Data.SQLClient.SQLConnection             
$DBConnection.ConnectionString="Server=$SQLServerName;Database=$SQLDatabase;`
Trusted_Connection=False;User ID='sa';Password='password'"                       
$DBConnection.Open()                                   
$DBCommand=New-Object System.Data.SQLClient.SQLCommand            
$DBCommand.Connection = $DBConnection            
$SelectStatement="SELECT *, Server AS Expr1 FROM tblServer"                        
$DBCommand.CommandText=$SelectStatement                        
$DBResult=$DBCommand.ExecuteReader()                        
$ServerTable=New-Object system.data.datatable                        
$ServerTable.load($DBResult)                         
$list = $ServerTable | Where-Object {$_.Synlig -eq 'True'} | `
Select-Object Server,IP_adress | Sort-Object Server

foreach ($item in  $list) {$item}            

How to remove line 2 in a txt-file and add a last line so it always is 25 lines including the header (first line)?

$txt = Get-Content C:\script\Powershell\hourly_temp.txt | select -First 1 -Last 23
$txt = $txt + ($hour + "," + $k1 + "," + $k2 + "," + $ups)                      
$txt | Out-File C:\script\Powershell\hourly_temp.txt -force -encoding ASCII