linux shell file size

Question

I want to get size of file into variable ? How to do that?

ls -l | grep testing.txt | cut -f6 -d\' \'

gave the size but how to store it in

Answer 1

size() {
  file="$1"
  if [ -b "$file" ]; then
    /sbin/blockdev --getsize64 "$file"
  else
    wc -c < "$file"  # Handles pseudo files like /proc/cpuinfo
    # stat --format %s "$file"
    # find "$file" -printf '%s\n'
    # du -b "$file" | cut -f1
  fi
}

fs=$(size testing.txt)