function/activedirectory/Set-ADUserPassword.ps1

Function Set-ADUserPassword {
    <#
    .SYNOPSIS
    Set password for AD user
 
    .DESCRIPTION
    This script creates random password and sets them to specific ad users.
 
    .PARAMETER User
    Ad user to get a new password.
 
    .PARAMETER PasswordLength
    The length of the new password.
 
    .INPUTS
    System.String[]
    System.Object[]
    System.Int[]
 
    .OUTPUTS
    System.Object[]
 
    .EXAMPLE
    Set-ADUserPassword -User gisp -PasswordLength 12
 
    .LINK
    https://github.com/gisp497/psgisp
#>

[CmdletBinding(SupportsShouldProcess)]
param (
    [Parameter(
        Mandatory=$true,
        ValueFromPipeline=$true,
        HelpMessage="Ad user to get a new password"
    )]
    $User,
    [Parameter(
        Mandatory=$false,
        ValueFromPipeline=$false,
        HelpMessage="Length of the password"
    )]
    [int]$PasswordLength = 24,
    [Parameter(
        Mandatory = $false,
        ValueFromPipeline = $false,
        HelpMessage = "number of special characters in password")]
    [int]$SpecialCharacter = 8
)
Begin{
    Write-Verbose "Install ActiveDirectory module"
    if(Get-Module -ListAvailable ActiveDirectory){
        Import-Module ActiveDirectory
    }else{
        Try{
            Install-WindowsFeature -Name "RSAT-AD-PowerShell"
        }catch{
            Throw "Cant import module ActiveDirectory. Error: $_"
        }
    }

    #create Output Array
    $OutputObject = @()
}
Process{
    #Get ADuser
    $user | Get-ADUser | Foreach-Object{
        Write-Verbose "Set the new user password"
        $password = Get-RandomString -Length $PasswordLength -SpecialCharacter $SpecialCharacter -SecureString
        Set-ADAccountPassword -Identity $_ -NewPassword $password -Reset

        #Create psobject
        $credential = New-Object -TypeName System.Management.Automation.PSCredential ($_.SamAccountName, $password)
        
        #Add Object to Array
        $OutputObject += $credential
    }
}
End{
    #Return output
    return $OutputObject
}
}