Which folder is most full? (ls_fullest, df, du, df -h, du -ks)

who_full.sh

#!/bin/bash

ls_fullest() {
  ls -a | egrep -v '^[.][.]?$' | while read e ; do x=`df -h "$e" | tail -1 | awk '{print $NF}'` ; [[ "$x" == "$tgt" ]] && sudo du -ks "$e" 2>/dev/null ; done | sort -n -k 1 | tail
}

tgt='/var' ;

cd "$tgt" ;
ls_fullest ;

cd someBigFolder ;
ls_fullest ;

# (Repeat....)

#