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In this case it's better do to use the dedicated tool
There is 1 alternative - vote for the best!
deletes line 3 in known_hosts text file
This is the quick and dirty alternative ;)
The whole file will be emptied, this is equal to /dev/null > ~/.ssh/known_hosts
I have this as a file called deletekey in my ~/bin.
Makes life a little easier.
If you can do better, submit your command here.
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