So the following are the 2 pieces of code.

Add the following code to the body tag inside master page. Make sure the below code is outside of any tag which has the runat=”server” property set.

<script type=”text/javascript”>var loginName = “<%= Microsoft.SharePoint.SPContext.Current.Web.CurrentUser.Name %>”;</script>

Now put the following code where ever required.

<span>Welcome, <script type=”text/javascript”>document.write(loginName);</script></span>

If you face the following error…check out the link https://blog.binarybits.net/?p=207

An unexpected error has occurred 

If you face the following error…check out the link https://blog.binarybits.net/?p=215

Code blocks are not allowed in this file

If you face the following error… check out the link https://blog.binarybits.net/?p=211

The Controls collection cannot be modified because the control contains code blocks (i.e. <% … %>).

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