Random string with PS

random_string.ps1

[CmdletBinding()]
<# 
    .SYNOPSIS 
        Create a random string of alphanumeric characters
 
    .DESCRIPTION
        This function creates a random string of alphanumeric characters.
        Alphanumeric characters are put into an array, joined, randomly picked and shuffled once more.
    .PARAMETER length 
        The length of the random string to be returned. 
        Default [int] 20.
    .PARAMETER n 
        This parameters makes it possible to have alphanumeric characters occur more than once in the string.
        Setting this parameter manually to 1 will return a random string without duplicates.
        Default [int] [math]::Floor([math]::sqrt($length)).
    .EXAMPLE  
        .\randomString.ps1
    .EXAMPLE  
        .\randomString.ps1 -length 25
    .EXAMPLE  
        .\randomString.ps1 -length 25 -n 1
    .NOTES 
        NAME:       randomString
        AUTHOR:     ToishY
        GIT:        https://github.com/ToishY/randomString
        CREATED:    05/01/2019 
        LASTEDIT:   05/01/2019
        VERSION:    1.0
#>

Param(
    [Parameter(Mandatory=$false)]
    [int]$length = 20,
    [Parameter(Mandatory=$false)]
    [int]$n = [math]::Floor([math]::sqrt($length))
)

function getRandomString{
    Param(
        [Parameter(Mandatory=$true)]
        [int]$len,
        [Parameter(Mandatory=$true)]
        [int]$m
    )

    return ( ( ( -join ( ( (48..57)*$m ) + ( (65..90)*$m ) + ( (97..122)*$m ) | Get-Random -Count $len | % { [char]$_} ) ) -split '' | Sort-Object {Get-Random}) -join '' )
}

# getRandomString
getRandomString -len $length -m $n