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check out uptime. Sample output:

   11:34:56 up 9 days,  3:24,  5 users,  load average: 3.08, 4.04, 14.66

and since i'm sure you forgot: load is “processes waiting for cpu time to execute”, the 3 numbers are “in the last minute”, “in the last 5 minutes”, and “in the last 15 minutes”. (i think).

anyway, let's get one of those numbers. Here's the sed command:

uptime | sed 's/^.*load average: \(\([0-9.]\)\{3,\}\).*$/\1/'

• escape the parenthesis.
• escape the brackets.
• there is no \d.
• don't escape the dot.
• escape the braces.
• Now, outside of the brackets, don't escape the dot. You'll notice that not escaping the dot now does the opposite.
• capture group 1 is not $1, it's \1.