Block All Web Crawlers

Written by  on October 5, 2017 

Kindly I need your help, I want to block all web crawlers except for main search engines. The reason for that is that I dont want competitors to see my website backlinks so I want to block tools like: moz,ahrefs,semrush….
Will that code work:

User-agent: google

User-agent: yahoo

User-agent: msn

User-agent: *
Disallow: /

Category : Uncategorized

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