SSH agent tweak for screen

.bashrc

# SSH agent tweak for screen
export SSH_AUTH_SOCK_TMP=/tmp/$LOGNAME-ssh-agent.sock

# test link reference
if [ ! -e "$SSH_AUTH_SOCK_TMP" ]; then
    # test that link exists
    if [ -L "$SSH_AUTH_SOCK_TMP" ]; then
        unlink $SSH_AUTH_SOCK_TMP
    fi

    ln -s $SSH_AUTH_SOCK $SSH_AUTH_SOCK_TMP
fi

export SSH_AUTH_SOCK_OLD=$SSH_AUTH_SOCK
export SSH_AUTH_SOCK=$SSH_AUTH_SOCK_TMP