.bashrc

SSH_ENV=$HOME/.ssh/environment

# start the ssh-agent
function start_agent {
    echo "Initializing new SSH agent..."
    # spawn ssh-agent
    /usr/bin/ssh-agent | sed 's/^echo/#echo/' > ${SSH_ENV}
    chmod 600 ${SSH_ENV}
    . ${SSH_ENV} > /dev/null
    /usr/bin/ssh-add
}

if [ -f "${SSH_ENV}" ]; then
     . ${SSH_ENV} > /dev/null
     ps -ef | grep ${SSH_AGENT_PID} | grep ssh-agent$ > /dev/null || {
        start_agent;
    }
else
    start_agent;
fi

# Note: ~/.ssh/environment should not be used, as it
#       already has a different purpose in SSH.
env=~/.ssh/agent.env
# Note: Don't bother checking SSH_AGENT_PID. It's not used
#       by SSH itself, and it might even be incorrect
#       (for example, when using agent-forwarding over SSH).
agent_is_running() {
    if [ "$SSH_AUTH_SOCK" ]; then
        # ssh-add returns:
        #   0 = agent running, has keys
        #   1 = agent running, no keys
        #   2 = agent not running
        ssh-add -l >/dev/null 2>&1 || [ $? -eq 1 ]
    else
        false
    fi
}
agent_has_keys() {
    ssh-add -l >/dev/null 2>&1
}
agent_load_env() {
    . "$env" >/dev/null
}
agent_start() {
    (umask 077; ssh-agent >"$env")
    . "$env" >/dev/null
}
if ! agent_is_running; then
    agent_load_env
fi
# if your keys are not stored in ~/.ssh/id_rsa.pub or ~/.ssh/id_dsa.pub, you'll need
# to paste the proper path after ssh-add
if ! agent_is_running; then
    agent_start
    ssh-add ~/.ssh/id_rsa_sc
elif ! agent_has_keys; then
    ssh-add ~/.ssh/id_rsa_sc
fi
unset env