Get last five minutes load average using ksh with uptime
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To an idea of CPU load average, I'm using `uptime` in a `ksh` script:

    uptime | awk '{print $11}' | sed '$s/.$//' | read CPU

where I then use the variable `CPU` later.

The `$11` part is to isolate the **last five minutes** part. But, I noticed today that this was not working. Specifically, the last five minutes part was returned with `$9`. Apparently the funtion is returning less parameters, but I'm not sure why.

Is there a way I can consistently get only the last five minutes part of uptime?