Find the average (over a minute) of %steal - yes it could use simplification.
iostat 1 60 | grep steal -A1 | awk '{print $5}' | grep -v iowait | grep -v "^$" | sort -n -k 1 | paste -sd+ - | bc | awk '{print $1/60}'
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iostat 1 60 | grep steal -A1 | awk '{print $5}' | grep -v iowait | grep -v "^$" | sort -n -k 1 | paste -sd+ - | bc | awk '{print $1/60}'