I'd like to add characters to the end of every line of text in a .txt document.

#Define Variables
$a = c:\foobar.txt
$b = get-content $a

#Define Functions
function append-text  
    {  
    foreach-Object  
        {  
        add "*"  
        }  
    }  

#Process Code
$b | append-text

Something like that. Essentially, load a given text file, add a "*" the the end of every single line of text in that text file, save and close.