Check folder size in Bash

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I’m trying to write a script that will calculate a directory size and if the size is less than 10GB, and greater then 2GB do some action. Where do I need to mention my folder name?

# 10GB
SIZE="1074747474"

# check the current size
CHECK="`du /data/sflow_log/`"
if [ "$CHECK" -gt "$SIZE" ]; then
  echo "DONE"
fi

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