How to script SQL Server Logins

Every now and then you add new instance you have to create logins on new server which are exact replica of some existing server. In that case it is tedious to create logins manually and a script that would do the job would be great.

I found a great script which does the same. Below is the script copied from the link. It is of great help.

USE [master]
GO

/****** Object:  UserDefinedFunction [dbo].[fn_hexadecimal]    ****/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

CREATE FUNCTION [dbo].[fn_hexadecimal] 
(
    -- Add the parameters for the function here
     @binvalue varbinary(256)
)
RETURNS VARCHAR(256)
AS
BEGIN

    DECLARE @charvalue varchar(256)
    DECLARE @i int
    DECLARE @length int
    DECLARE @hexstring char(16)
    SELECT @charvalue = '0x'
    SELECT @i = 1
    SELECT @length = DATALENGTH (@binvalue)
    SELECT @hexstring = '0123456789ABCDEF' 
    WHILE (@i <= @length) 
    BEGIN
      DECLARE @tempint int
      DECLARE @firstint int
      DECLARE @secondint int
      SELECT @tempint = CONVERT(int, SUBSTRING(@binvalue,@i,1))
      SELECT @firstint = FLOOR(@tempint/16)
      SELECT @secondint = @tempint - (@firstint*16)
      SELECT @charvalue = @charvalue +
        SUBSTRING(@hexstring, @firstint+1, 1) +
        SUBSTRING(@hexstring, @secondint+1, 1)
      SELECT @i = @i + 1
    END
    return @charvalue

END
GO


SET NOCOUNT ON
GO
--use MASTER
GO
PRINT '-----------------------------------------------------------------------------'
PRINT '-- Script created on ' + CAST(GETDATE() AS VARCHAR(100))
PRINT '-----------------------------------------------------------------------------'
PRINT ''
PRINT '-----------------------------------------------------------------------------'
PRINT '-- Create the windows logins'
PRINT '-----------------------------------------------------------------------------'
SELECT 'IF NOT EXISTS (SELECT * FROM master.sys.server_principals WHERE [name] = ''' + [name] + ''')
    CREATE LOGIN [' + [name] + '] FROM WINDOWS WITH DEFAULT_DATABASE=[' + 
        default_database_name + '], DEFAULT_LANGUAGE=[us_english]
GO

'
FROM master.sys.server_principals
where type_desc In ('WINDOWS_GROUP', 'WINDOWS_LOGIN')
AND [name] not like 'BUILTIN%'
and [NAME] not like 'NT AUTHORITY%'
and [name] not like '%\SQLServer%'
GO

PRINT '-----------------------------------------------------------------------------'
PRINT '-- Create the SQL Logins'
PRINT '-----------------------------------------------------------------------------'
select 'IF NOT EXISTS (SELECT * FROM master.sys.sql_logins WHERE [name] = ''' + [name] + ''')
    CREATE LOGIN [' + [name] + '] 
        WITH PASSWORD=' + [master].[dbo].[fn_hexadecimal](password_hash) + ' HASHED,
        SID = ' + [master].[dbo].[fn_hexadecimal]([sid]) + ',  
        DEFAULT_DATABASE=[' + default_database_name + '], DEFAULT_LANGUAGE=[us_english], 
        CHECK_EXPIRATION=' + CASE WHEN is_expiration_checked = 1 THEN 'ON' ELSE 'OFF' END + ', CHECK_POLICY=OFF
GO
IF EXISTS (SELECT * FROM master.sys.sql_logins WHERE [name] = ''' + [name] + ''')
    ALTER LOGIN [' + [name] + ']
        WITH CHECK_EXPIRATION=' + 
            CASE WHEN is_expiration_checked = 1 THEN 'ON' ELSE 'OFF' END + ', CHECK_POLICY=' + 
            CASE WHEN is_policy_checked = 1 THEN 'ON' ELSE 'OFF' END + '
GO


'
--[name], [sid] , password_hash 
from master.sys.sql_logins 
where type_desc = 'SQL_LOGIN' 
and [name] not in ('sa', 'guest')

PRINT '-----------------------------------------------------------------------------'
PRINT '-- Disable any logins'
PRINT '-----------------------------------------------------------------------------'
SELECT 'ALTER LOGIN [' + [name] + '] DISABLE
GO
' 
from master.sys.server_principals 
where is_disabled = 1

PRINT '-----------------------------------------------------------------------------'
PRINT '-- Assign groups'
PRINT '-----------------------------------------------------------------------------'
select 
'EXEC master..sp_addsrvrolemember @loginame = N''' + l.name + ''', @rolename = N''' + r.name + '''
GO

'
from master.sys.server_role_members rm
join master.sys.server_principals r on r.principal_id = rm.role_principal_id
join master.sys.server_principals l on l.principal_id = rm.member_principal_id
where l.[name] not in ('sa')
AND l.[name] not like 'BUILTIN%'
and l.[NAME] not like 'NT AUTHORITY%'
and l.[name] not like '%\SQLServer%'