grep -v > tmp && mv keeps the temp file's umask mode, so an offboard left authorized_keys 0666 and sshd StrictModes silently refused every key in it — including the one the next onboard installs.
grep -v > tmp && mv keeps the temp file's umask mode, so an offboard left authorized_keys 0666 and sshd StrictModes silently refused every key in it — including the one the next onboard installs.