#!/bin/bash
# sum the sizes of the file names received from the command line
# if those names correspond to files (not directories) and those files
# are writable
TOT=0
for FILE in $@
do
  if [[ -w $FILE  && -f $FILE ]]
  then
    ADET=( `ls -l $FILE` )
    TOT=$(( $TOT + ${ADET[4]} ))
    echo $FILE ${ADET[4]}
    ((CNT++))
  fi
done
echo $TOT