#! /bin/sh
# #############################################################################

       NAME_="filesize"
       HTML_="print size of files"
    PURPOSE_="print sum of the actual size of files"
   SYNOPSIS_="$NAME_ [-hld] <file> [file...]"
   REQUIRES_="standard GNU commands"
    VERSION_="1.2"
       DATE_="2002-03-07; last update: 2004-02-15"
     AUTHOR_="Dawid Michalczyk <dm@eonworks.com>"
        URL_="www.comp.eonworks.com"
   CATEGORY_="file"
   PLATFORM_="Linux"
      SHELL_="bash"
 DISTRIBUTE_="yes"

# #############################################################################
# This program is distributed under the terms of the GNU General Public License

usage () {

echo >&2 "$NAME_ $VERSION_ - $PURPOSE_
Usage: $SYNOPSIS_
Requires: $REQUIRES_
Options:
     -d, print sum of actual size dot delimited
     -h, usage and options (this help)
     -l, see this script"
    exit 1
}

# local funcs
string_intDelim () {
    echo $1 | sed '{ s/$/@/; : loop; s/\(...\)@/@.\1/; t loop; s/@//; s/^\.//; }'
 }

# arg check
[ $# -eq 0 ] && { echo >&2 missing argument, type $NAME_ -h for help; exit 1; }

# var init
t=0
delimit=

# arg handling and execution
case "$1" in
    
    -h) usage ;;
    -l) more $0; exit 1 ;;
     *) # main execution

        [[ "$1" == -d ]] && { delimit=on; shift; }

        for a in "$@";do
            if [ -f "$a" ]; then
                s=$(set -- $(ls -l "$a"); echo $5)
                ((t+=s))
            else
                echo file "$a" does not exist
            fi
        done ;;

esac

[ $delimit ] && { echo $(string_intDelim $t); } || echo $t