#! /usr/bin/env sh

main()
{
	seconds=$(awk -F. '{print $1}' < /proc/uptime)

	printf "%dd %02dh %02dm %02ds\n" \
		"$(( seconds / 60 / 60 / 24 ))" \
		"$(( seconds / 60 / 60 % 24 ))" \
		"$(( seconds / 60 % 60 ))" \
		"$(( seconds % 60 ))"
}

main "$@"