Wesseldr

# Add this to your .profile or .bash_profile, Tested on OsX 10.12, untested on Debian & Linux.
# Share ssh-agent between new shells and not start a new agent every new shell is opend.
# Warning! this can be a security risk for evil scripts
if [ -z "$SSH_AUTH_SOCK" ]; then
        if ! pgrep -xu $(id -u) ssh-agent > /dev/null; then
                ssh-agent | grep -v ^echo > ~/.ssh-agent.sh
        fi
        . ~/.ssh-agent.sh
fi

Wesseldr

# Add this to your .profile or .bash_profile, Tested on OsX 10.12, untested on Debian & Linux.
# Check if OpenSC smartcard is already added to an empty ssh-agent than add smart card, else skip this
ssh-add -L | grep "The agent has no identities" > /dev/null
if [ $? -eq 0 ]; then
        ssh-add -s /usr/local/lib/opensc-pkcs11.so
fi