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How to add an entry with a condition to hosts file?

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Last Modified: 2016-09-01
I need to write a script to verify if one specific entry "10.1.17.21  server1" exists in the hosts file or not. If yes, do nothing, else insert that entry into the hosts file.  
This script will be put in the login script to assure all users with this entry in their hosts file.  

Can you help please?
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