One of the things I often have to do when arriving at a new customer is adding my public keys on the hosts I have to work on. To simplify this process I use the following script:

#! /bin/sh
# Installs the jnieuwen ssh keys on an account.

mkdir $HOME/.ssh || exit 1
chmod u+rwx $HOME/.ssh || exit 1

cat $0 | sed "1,/^CUTFROMHERE/d" >> $HOME/.ssh/authorized_keys || exit 1

chmod og-rw $HOME/.ssh/* || exit 1
chmod og-rwx $HOME/.ssh || exit 1

exit 0
CUTFROMHERE
ssh-rsa AAAAB3Nz5[........]dtM0S4fdd
ssh-rsa AAAAB3Nza[........]A5F7lnhdD

So I just copy this script with scp to the host and then execute:
ssh <host> sh <script>
To use it just replace the SSH public keys after the CUTFROMHERE rule with your own.

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