I need the EXACT same output as Linux's "cat /proc/uptime".

For example, with /proc/uptime, you'd get

> 
> 1884371.64 38646169.12
> 
> 
> 

but with any Mac alternative, like "uptime", you'd get

> 
> 20:25 up 20:26, 6 users, load averages: 3.19 2.82 2.76
> 
> 
> 

I need it to be **exactly** like cat /proc/uptime, but on Mac OS X.