Copy your ssh public key to a server from a machine that doesn’t have ssh-copy-id

$ cat ~/.ssh/id_rsa.pub | ssh “(cat > tmp.pubkey ; mkdir -p .ssh ; touch .ssh/authorized_keys ; sed -i.bak -e ‘/$(awk ‘{print $NF}’ ~/.ssh/id_rsa.pub)/d’ .ssh/authorized_keys; cat tmp.pubkey >> .ssh/authorized_keys; rm tmp.pubkey)”

This one is a bit more robust — the remote machine may not have an .ssh directory, and it may not have an authorized_keys file, but if it does already, and you want to replace your ssh public key for some reason, this will work in that case as well, without duplicating the entry.

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by David Winterbottom (codeinthehole.com)

Tags: bash tips free scripts linux tricks