Powershell function to get the endline format of a file.

get-endlineformat.ps1

function Get-EndlineFormat {
param($filepath)
    # by default get-content reads one 'item' at a time.
    # and reading 1 byte at a time will take a long long time
    # -ReadCount 0 makes it read it all at once.
    $bytes = get-content -encoding byte -ReadCount 0 $filepath
    $string = [Text.Encoding]::Ascii.GetString($bytes, 0, $bytes.Count)
    
    $is_unix = ([regex] "[^`r]`n").Matches($string).Count -gt 0 `
        -and ([regex] "`r`n").Matches($string).Count -eq 0
        
    $is_windows = ([regex] "[^`r]`n").Matches($string).Count -eq 0 `
        -and ([regex] "`r`n").Matches($string).Count -gt 0
        
    if($is_unix -and $is_windows){
        return "mixed"
    }
    if($is_unix){
        return "unix"
    }
    if($is_windows){
        return "windows"
    }
}