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# add next command to the command line
alias duf='du -sk * | sort -n | while read size fname; do for unit in k M G T P E Z Y; do if [ $size -lt 1024 ]; then echo -e "${size}${unit} - ${fname}"; break; fi; size=$((size/1024)); done; done'

# run next commands and see output
cd /
duf

# more info at http://www.carlessanagustin.com/2010/09/22/shell-como-obtener-el-tamano-de-carpeta-via-linea-de-comandos/