#!/bin/bash

# Summing sizes, using an inner loop

TOT=0
for FILE in $@
do
  if [[ -x $FILE  && -f $FILE ]]
  then
    DET=`ls -l $FILE`  # for a particlar file, get its details
    CNT=0
    for DETP in $DET  # cycle through file details until get to size
    do
      if [ $CNT -eq 4 ]
      then
        TOT=$(( $TOT + $DETP ))
        echo $FILE $DETP
      fi
    ((CNT++))
    done
  fi
done
echo $TOT