Comment 30 for bug 52454

This package
http://www.kde-apps.org/content/show.php/kssh-add?content=76675

Does the whole thing very seamlessly. Sorry Matt, I couldn't make your scripts work, but this more or less does the same.

Personally, I don't always want to run ssh-add at startup, so I use

alias ssh='if [[ ! `ssh-add -l| grep .ssh | wc -l` > 0 ]]; then ssh-add < /dev/null; fi; ssh'

in my .bashrc so that I run ssh-add if it doesn't already have the passphrase.