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There's quite a few packages that will do something like this in possibly more efficient (parallel!) and structured way.

In RHEL7/Centos7 for example there is dsh, mpssh, mussh and of course Ansible (mentioned)

(I'd like to see a mention of why he chose StrictHostKeyChecking=no)

Oh, I didn't know about either mpssh and mussh! Thanks a lot for mentioning, it does the job super well!

I'll update the article with a note about disabling the checking. Thanks!

`mpssh` does the job so well! I'll update the post with a quick use of it as well. Thx!

You're welcome! I was meaning to do a comparison of these tools myself; good luck with them.