file="$HOME/.ssh-agent"

which ssh-agent &> /dev/null
if (( $? )); then
	exit 1
fi

if [[ -n "$SSH_AUTH_SOCK" ]] && [[ -n "$SSH_AGENT_PID" ]]; then
	return
fi

if [[ -e $file ]]; then
	sockenv=`cat $file | grep SSH_AUTH_SOCK`
	pidenv=`cat $file | grep SSH_AGENT_PID`
	pid=`printf "$pidenv" | grep -o "[0-9]*"`

	ps --pid "$pid" &> /dev/null
	if (( ! $? )); then
		export "$sockenv"
		export "$pidenv"
		return
	fi
fi

export $(ssh-agent -s |
	awk '{
		if ($1 ~ ".*=.*;") {
			print substr($1, 0, length($1) - 1)
		}
	}' |
	tee "$file")
chmod 600 "$file"