Replace or delete ssh key in authorized_key files

replace-ssh-key.md

Test for replacement

sed -n 's#ssh-rsa.*OLD_KEY_ID#NEW_KEY# p' .ssh/authorized_keys

Test for deleting

sed -n '#ssh-rsa.*KEY_ID# p' .ssh/authorized_keys

Do replacement in multiple authorized_key files (change maxdepth to your needs)

sudo find . -maxdepth 3 -name "authorized_keys" -exec sed -i.old 's#ssh-rsa.*OLD_KEY_ID#NEW_KEY#' {} \;

Do delete in multiple authorized_key files (change maxdepth to your needs)

sudo find . -maxdepth 3 -name "authorized_keys" -exec sed -i.old '#ssh-rsa.*KEY_ID# D' {} \;

Tip: use a bash variable e.g. $NEW_KEY to use in your commands. Note that you'll need to use double instead of single quotes in the sed command.