On Linux press F9 return a correct 

~


On unix(solaris or hpux) return

0~


How to set correct tilde on those systems?


Question: Manipulate SearchCenter how showing the results
Answer: The display of the results on controlled by XSLT in the Core Results web part.

For a start on how to change it follow Walkthrough: Add a Tab and Custom Search Page with Enterprise Search Web Parts to the Search Center you can skip the add tab and create pages part (and yes it also applies to SharePoint 2010)