Sum all pod resource (requests & limits)

Just need bash, kubectl and kubeadmin permission.

#!/bin/bash
  
kubectl describe  nodes | grep --no-group-separator -A3 "Resource" > .$$

res=$(grep cpu .$$ | awk {'print $2'})
let tot=0
for i in $res
do
   if [[ $i =~ "m" ]]; then
      i=$(echo $i | sed 's/[^0-9]*//g')
      tot=$(( tot + i ))
   else
      tot=$(( tot + i*1000 ))
   fi
done
echo "CPU requests: " $tot"m"


res=$(grep cpu .$$ | awk {'print $4'})
let tot=0
for i in $res
do
   if [[ $i =~ "m" ]]; then
      i=$(echo $i | sed 's/[^0-9]*//g')
      tot=$(( tot + i ))
   else
      tot=$(( tot + i*1000 ))
   fi
done
echo "CPU limits: " $tot"m"

res=$(grep memory .$$ | awk {'print $2'})
let tot=0
for i in $res
do
   if [[ $i =~ "K" ]]; then
      i=$(echo $i | sed 's/[^0-9]*//g')
      tot=$(( tot + i*1024 ))
   elif [[ $i =~ "M" ]]; then
      i=$(echo $i | sed 's/[^0-9]*//g')
      tot=$(( tot + i*1048576 ))
   elif  [[ $i =~ "G" ]]; then
      i=$(echo $i | sed 's/[^0-9]*//g')
      tot=$(( tot + i*1073741824 ))
   elif  [[ $i =~ "m" ]]; then
      i=$(echo $i | sed 's/[^0-9]*//g')
      tot=$(( tot + i/1024 ))
   else
      tot=$(( tot + i ))
   fi
done
echo "Memory requests: " $(( tot/1073741824 )) " GB"

res=$(grep memory .$$ | awk {'print $4'})
let tot=0
for i in $res
do
   if [[ $i =~ "K" ]]; then
      i=$(echo $i | sed 's/[^0-9]*//g')
      tot=$(( tot + i*1024 ))
   elif [[ $i =~ "M" ]]; then
      i=$(echo $i | sed 's/[^0-9]*//g')
      tot=$(( tot + i*1048576 ))
   elif  [[ $i =~ "G" ]]; then
      i=$(echo $i | sed 's/[^0-9]*//g')
      tot=$(( tot + i*1073741824 ))
   elif  [[ $i =~ "m" ]]; then
      i=$(echo $i | sed 's/[^0-9]*//g')
      tot=$(( tot + i/1024 ))
   else
      tot=$(( tot + i ))
   fi
done
echo "Memory limits: " $(( tot/1073741824 )) " GB"

rm .$$ &>/dev/null

Sample:

$ ./resource_total.sh 
CPU requests:  25575m
CPU limits:  32800m
Memory requests:  37  GB
Memory limits:  73  GB

refer:
https://stackoverflow.com/questions/66007364/how-can-i-summarize-all-the-resource-limits-and-requests-in-kubernetes-with-kube