All bash version of it... pgrep -f $1 | xargs -I{} pmap -x {} | grep total | awk '{sum=sum+$4}END{printf "%.2f%s", sum/1024," MB\n"}' e.g. $ pgrep -f bash | x

All bash version of it... pgrep -f $1 | xargs -I{} pmap -x {} | grep total | awk '{sum=sum+$4}END{printf "%.2f%s", sum/1024," MB\n"}' e.g. $ pgrep -f bash | xargs -I{} pmap -x {} | grep total | awk '{sum=sum+$4}END{printf "%.2f%s", sum/1024," MB\n"}' 74.79 MB