run ssh agent or connect to exisiting

.bashrc

AGENT_DATA_PATH=~/.ssh/agent-data

function s {
    . $AGENT_DATA_PATH
    if ssh-add -l >/dev/null 2>&1
    then
        true
    else
      echo "not running"
      ssh-agent >$AGENT_DATA_PATH
      . $AGENT_DATA_PATH
      ssh-add
    fi
}